Make sure to call SIL default arg generator for a package func

or initializer so the mangled symbol is added to TBD.

Resolves rdar://116184295

Author: elsh

lib/SIL/IR/SILSymbolVisitor.cpp

@@ -421,7 +421,8 @@ class SILSymbolVisitorImpl : public ASTVisitor<SILSymbolVisitorImpl> {
   void visitDefaultArguments(ValueDecl *VD, ParameterList *PL) {
     auto moduleDecl = VD->getModuleContext();
     auto publicDefaultArgGenerators = moduleDecl->isTestingEnabled() ||
-                                      moduleDecl->arePrivateImportsEnabled();
+                                      moduleDecl->arePrivateImportsEnabled() ||
+                                      moduleDecl->getPackage() != nullptr;
     if (Ctx.getOpts().PublicSymbolsOnly && !publicDefaultArgGenerators)
       return;
 

test/Sema/package_symbol_with_default_arg.swift

@@ -0,0 +1,36 @@
+// RUN: %empty-directory(%t)
+// RUN: split-file %s %t
+
+// RUN: %target-build-swift-dylib(%t/%target-library-name(Utils)) %t/Utils.swift -module-name Utils -package-name mypkg -emit-module -emit-module-path %t/Utils.swiftmodule -emit-tbd -emit-tbd-path %t/libUtils.tbd -emit-sil -o %t/utils.sil
+// RUN: %FileCheck %s --check-prefix CHECK-TBD < %t/libUtils.tbd
+// CHECK-TBD-NOT: _$s5Utils6pubBar3argS2i_tFfA_
+// CHECK-TBD: _$s5Utils6pkgBar3argS2i_tF
+// CHECK-TBD: _$s5Utils6pkgBar3argS2i_tFfA_
+// CHECK-TBD: _$s5Utils6pkgFoo3argS2i_tF
+// CHECK-TBD: _$s5Utils6pubBar3argS2i_tF
+// CHECK-TBD: _$s5Utils6pubFoo3argS2i_tF
+
+// RUN: %target-build-swift -I %t -L %t -lUtils %s -o %t/main %target-rpath(%t) -package-name mypkg
+
+// RUN: %target-run %t/main %t/%target-library-name(Utils) > %t/run-result.output
+// RUN: %FileCheck %s --check-prefix CHECK-RUN < %t/run-result.output
+
+//--- Utils.swift
+public func pubBar(arg: Int = 1) -> Int { return arg + 11 }
+package func pkgBar(arg: Int = 1) -> Int { return arg + 12 }
+func internalBar(arg: Int = 1) -> Int { return arg + 13 }
+
+public func pubFoo(arg: Int) -> Int { return arg + 1 }
+package func pkgFoo(arg: Int) -> Int { return arg + 2 }
+func internalFoo(arg: Int) -> Int { return arg + 3 }
+
+//--- main.swift
+import Utils
+
+let a = pubBar()
+let b = pkgBar()
+
+let c = pubFoo(arg: 3)
+let d = pkgFoo(arg: 5)
+
+print(a, b, c, d) // CHECK-RUN: 12 13 4 7