CxxInterop: remove checks for NoncopyableGenerics

It will always evaluate to true now; it's not experimental. This change
effectively reverts the following:
 - 6140ba1
 - 78eee32

(cherry picked from commit b04be89)

Author: kavon

lib/ClangImporter/ClangImporter.cpp

@@ -5763,20 +5763,6 @@ cloneBaseMemberDecl(ValueDecl *decl, DeclContext *newContext) {
   }
 
   if (auto var = dyn_cast<VarDecl>(decl)) {
-    auto oldContext = var->getDeclContext();
-    auto oldTypeDecl = oldContext->getSelfNominalTypeDecl();
-    // If the base type is non-copyable, and non-copyable generics are disabled,
-    // we cannot synthesize the accessor, because its implementation would use
-    // `UnsafePointer<BaseTy>`.
-    // We cannot use `ty->isNoncopyable()` here because that would create a
-    // cyclic dependency between ModuleQualifiedLookupRequest and
-    // LookupConformanceInModuleRequest, so we check for the presence of
-    // move-only attribute that is implicitly added to non-copyable C++ types by
-    // ClangImporter.
-    if (oldTypeDecl->getAttrs().hasAttribute<MoveOnlyAttr>() &&
-        !context.LangOpts.hasFeature(Feature::NoncopyableGenerics))
-      return nullptr;
-
     auto rawMemory = allocateMemoryForDecl<VarDecl>(var->getASTContext(),
                                                     sizeof(VarDecl), false);
     auto out =

lib/ClangImporter/ImportType.cpp

@@ -509,26 +509,6 @@ namespace {
         return importFunctionPointerLikeType(*type, pointeeType);
       }
 
-      // If non-copyable generics are disabled, we cannot specify
-      // UnsafePointer<T> with a non-copyable type T.
-      // We cannot use `ty->isNoncopyable()` here because that would create a
-      // cyclic dependency between ModuleQualifiedLookupRequest and
-      // LookupConformanceInModuleRequest, so we check for the presence of
-      // move-only attribute that is implicitly added to non-copyable C++ types
-      // by ClangImporter.
-      if (pointeeType && pointeeType->getAnyNominal() &&
-          pointeeType->getAnyNominal()
-              ->getAttrs()
-              .hasAttribute<MoveOnlyAttr>() &&
-          !Impl.SwiftContext.LangOpts.hasFeature(
-              Feature::NoncopyableGenerics)) {
-        auto opaquePointerDecl = Impl.SwiftContext.getOpaquePointerDecl();
-        if (!opaquePointerDecl)
-          return Type();
-        return {opaquePointerDecl->getDeclaredInterfaceType(),
-                ImportHint::OtherPointer};
-      }
-
       PointerTypeKind pointerKind;
       if (quals.hasConst()) {
         pointerKind = PTK_UnsafePointer;

test/Interop/Cxx/class/move-only/move-only-cxx-value-type-generics.swift

@@ -1,5 +1,5 @@
-// RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=upcoming-swift -enable-experimental-feature NoncopyableGenerics)
-// RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=upcoming-swift -enable-experimental-feature NoncopyableGenerics -O -Xfrontend -sil-verify-none)
+// RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=upcoming-swift)
+// RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=upcoming-swift -O -Xfrontend -sil-verify-none)
 //
 // REQUIRES: executable_test
 // REQUIRES: GH_ISSUE_70246

test/Interop/Cxx/class/move-only/move-only-cxx-value-type-module-interface.swift

@@ -1,8 +1,4 @@
-// RUN: %target-swift-ide-test -print-module -module-to-print=MoveOnlyCxxValueType -I %S/Inputs -cxx-interoperability-mode=upcoming-swift -source-filename=x | %FileCheck %s --check-prefix=CHECK-NO-NCG
-// RUN: %target-swift-ide-test -print-module -module-to-print=MoveOnlyCxxValueType -I %S/Inputs -cxx-interoperability-mode=upcoming-swift -source-filename=x -enable-experimental-feature NoncopyableGenerics | %FileCheck %s --check-prefix=CHECK-NCG
-
-// CHECK-NO-NCG: func getNonCopyablePtr() -> OpaquePointer
-// CHECK-NO-NCG: func getNonCopyableDerivedPtr() -> OpaquePointer
+// RUN: %target-swift-ide-test -print-module -module-to-print=MoveOnlyCxxValueType -I %S/Inputs -cxx-interoperability-mode=upcoming-swift -source-filename=x | %FileCheck %s --check-prefix=CHECK-NCG
 
 // CHECK-NCG: func getNonCopyablePtr() -> UnsafeMutablePointer<NonCopyable>
 // CHECK-NCG: func getNonCopyableDerivedPtr() -> UnsafeMutablePointer<NonCopyableDerived>

test/Interop/Cxx/class/move-only/move-only-cxx-value-type.swift

@@ -1,8 +1,6 @@
 // RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=upcoming-swift)
-// RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=upcoming-swift -enable-experimental-feature NoncopyableGenerics -D HAS_NONCOPYABLE_GENERICS)
 // RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=swift-5.9 -O)
 // RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=swift-6 -O)
-// RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=swift-6 -O -enable-experimental-feature NoncopyableGenerics -D HAS_NONCOPYABLE_GENERICS)
 
 // REQUIRES: executable_test
 
@@ -29,12 +27,10 @@ MoveOnlyCxxValueType.test("Test derived move only type member access") {
   var k = c.method(-3)
   expectEqual(k, -6)
   expectEqual(c.method(1), 2)
-#if HAS_NONCOPYABLE_GENERICS
   k = c.x
   expectEqual(k, 2)
   c.x = 11
   expectEqual(c.x, 11)
-#endif
   k = c.mutMethod(-13)
   expectEqual(k, -13)
 }
@@ -60,7 +56,6 @@ MoveOnlyCxxValueType.test("Test move only field access in holder") {
   expectEqual(c.x.x, 5)
 }
 
-#if HAS_NONCOPYABLE_GENERICS
 MoveOnlyCxxValueType.test("Test move only field access in derived holder") {
   var c = NonCopyableHolderDerivedDerived(-11)
   var k = borrowNC(c.x)
@@ -74,6 +69,5 @@ MoveOnlyCxxValueType.test("Test move only field access in derived holder") {
   c.x.mutMethod(5)
   expectEqual(c.x.x, 5)
 }
-#endif
 
 runAllTests()

test/Interop/Cxx/operators/move-only/move-only-synthesized-properties.swift

@@ -1,11 +1,9 @@
 // RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=swift-5.9)
 // RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=swift-6)
 // RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=upcoming-swift)
-// RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=upcoming-swift -enable-experimental-feature NoncopyableGenerics -D HAS_NONCOPYABLE_GENERICS)
 // RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=swift-5.9 -O)
 // RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=swift-6 -O)
 // RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=upcoming-swift -O)
-// RUN: %target-run-simple-swift(-I %S/Inputs/ -cxx-interoperability-mode=upcoming-swift -O -enable-experimental-feature NoncopyableGenerics -D HAS_NONCOPYABLE_GENERICS)
 //
 // REQUIRES: executable_test
 
@@ -92,7 +90,6 @@ MoveOnlyCxxOperators.test("testNonCopyableHolderValueMutDeref pointee value") {
   expectEqual(k.x, k2.x)
 }
 
-#if HAS_NONCOPYABLE_GENERICS
 MoveOnlyCxxOperators.test("NonCopyableHolderConstDerefDerivedDerived pointee borrow") {
   let holder = NonCopyableHolderConstDerefDerivedDerived(11)
   var k = borrowNC(holder.pointee)
@@ -160,6 +157,5 @@ MoveOnlyCxxOperators.test("testNonCopyableHolderValueMutDerefDerivedDerived poin
   var k2 = holder.pointee
   expectEqual(k.x, k2.x)
 }
-#endif
 
 runAllTests()