Importer: remove ImportAsMember support

This functionality is not actively in use and the last usage of this has
been removed.  Remove the infrastructure that is no longer in need.

Author: compnerd

include/swift/Basic/LangOptions.h

@@ -276,13 +276,6 @@ namespace swift {
     /// [TODO: Clang-type-plumbing] Turn on for feature rollout.
     bool UseClangFunctionTypes = false;
 
-    /// Whether to use the import as member inference system
-    ///
-    /// When importing a global, try to infer whether we can import it as a
-    /// member of some type instead. This includes inits, computed properties,
-    /// and methods.
-    bool InferImportAsMember = false;
-
     /// If set to true, compile with the SIL Opaque Values enabled.
     /// This is for bootstrapping. It can't be in SILOptions because the
     /// TypeChecker uses it to set resolve the ParameterConvention.
@@ -613,13 +606,6 @@ namespace swift {
     /// instead of dropped altogether when possible.
     bool ImportForwardDeclarations = false;
 
-    /// Whether to use the import as member inference system
-    ///
-    /// When importing a global, try to infer whether we can import it as a
-    /// member of some type instead. This includes inits, computed properties,
-    /// and methods.
-    bool InferImportAsMember = false;
-
     /// If true ignore the swift bridged attribute.
     bool DisableSwiftBridgeAttr = false;
 
@@ -652,7 +638,6 @@ namespace swift {
                           static_cast<uint8_t>(Mode),
                           DetailedPreprocessingRecord,
                           ImportForwardDeclarations,
-                          InferImportAsMember,
                           DisableSwiftBridgeAttr,
                           DisableOverlayModules);
     }

include/swift/Option/FrontendOptions.td

@@ -420,10 +420,6 @@ def disable_conformance_availability_errors : Flag<["-"],
 def report_errors_to_debugger : Flag<["-"], "report-errors-to-debugger">,
   HelpText<"Deprecated, will be removed in future versions.">;
 
-def enable_infer_import_as_member :
-  Flag<["-"], "enable-infer-import-as-member">,
-  HelpText<"Infer when a global could be imported as a member">;
-
 def enable_swift3_objc_inference : Flag<["-"], "enable-swift3-objc-inference">,
   Flags<[FrontendOption, HelpHidden]>,
 HelpText<"Enable Swift 3's @objc inference rules for NSObject-derived classes and 'dynamic' members (emulates Swift 3 behavior)">;

lib/ClangImporter/CMakeLists.txt

@@ -14,7 +14,6 @@ add_swift_host_library(swiftClangImporter STATIC
   ClangModuleDependencyScanner.cpp
   ClangSourceBufferImporter.cpp
   DWARFImporter.cpp
-  IAMInference.cpp
   ImportDecl.cpp
   ImportEnumInfo.cpp
   ImportMacro.cpp

lib/ClangImporter/ClangImporter.cpp

@@ -15,7 +15,6 @@
 //===----------------------------------------------------------------------===//
 #include "swift/ClangImporter/ClangImporter.h"
 #include "ClangDiagnosticConsumer.h"
-#include "IAMInference.h"
 #include "ImporterImpl.h"
 #include "swift/AST/ASTContext.h"
 #include "swift/AST/ClangModuleLoader.h"
@@ -1027,8 +1026,7 @@ ClangImporter::create(ASTContext &ctx,
           importer->Impl.BridgingHeaderLookupTable,
           importer->Impl.LookupTables, importer->Impl.SwiftContext,
           importer->Impl.getBufferImporterForDiagnostics(),
-          importer->Impl.platformAvailability,
-          importer->Impl.InferImportAsMember));
+          importer->Impl.platformAvailability));
 
   // Create a compiler instance.
   {
@@ -1144,7 +1142,7 @@ ClangImporter::create(ASTContext &ctx,
 
   importer->Impl.nameImporter.reset(new NameImporter(
       importer->Impl.SwiftContext, importer->Impl.platformAvailability,
-      importer->Impl.getClangSema(), importer->Impl.InferImportAsMember));
+      importer->Impl.getClangSema()));
 
   // FIXME: These decls are not being parsed correctly since (a) some of the
   // callbacks are still being added, and (b) the logic to parse them has
@@ -2033,7 +2031,6 @@ ClangImporter::Implementation::Implementation(
     DWARFImporterDelegate *dwarfImporterDelegate)
     : SwiftContext(ctx),
       ImportForwardDeclarations(ctx.ClangImporterOpts.ImportForwardDeclarations),
-      InferImportAsMember(ctx.ClangImporterOpts.InferImportAsMember),
       DisableSwiftBridgeAttr(ctx.ClangImporterOpts.DisableSwiftBridgeAttr),
       BridgingHeaderExplicitlyRequested(!ctx.ClangImporterOpts.BridgingHeader.empty()),
       DisableOverlayModules(ctx.ClangImporterOpts.DisableOverlayModules),