[clang] Reinstate also decls with internal linkage as deferred:

on macOS11, stressInterpreter fails with not re-emitting _ZL6strstrUa9enable_ifILb1EEPKcS0_.
It has internal linkage: originally deferred, it needs a chance to be re-emitted.
Simplify this to include anything that was deferred and is either weak-for-linker or
internal, to hopefully match all cases.

Author: Axel-Naumann

interpreter/llvm/src/tools/clang/lib/CodeGen/CodeGenModule.h

@@ -361,8 +361,8 @@ class CodeGenModule : public CodeGenTypeCache {
       = IsAFunction ? getFunctionLinkage(GD) :
       getLLVMLinkageVarDefinition(VD, isTypeConstant(VD->getType(),
                                                      ExcludeCtor));
-    if (llvm::GlobalValue::isLinkOnceLinkage(L)
-        || llvm::GlobalValue::isWeakLinkage(L)) {
+    if (llvm::GlobalValue::isWeakForLinker(L)
+        || llvm::GlobalValue::isInternalLinkage(L)) {
       if (MangledName.empty())
         MangledName = getMangledName(GD);
       EmittedDeferredDecls[MangledName] = GD;