CodeGenModule.cpp: [PR33810][Modules] Remove an assertion that confirms MangledDeclNames[CanonicalGD] might be still empty.

FIXME: It is accepted that MangledDeclNames[CanonicalGD] is overwritten here?
llvm-svn: 309504

clang/lib/CodeGen/CodeGenModule.cpp

@@ -745,8 +745,6 @@ StringRef CodeGenModule::getMangledName(GlobalDecl GD) {
 
   // Keep the first result in the case of a mangling collision.
   auto Result = Manglings.insert(std::make_pair(Str, GD));
-  assert(MangledDeclNames.find(CanonicalGD) == MangledDeclNames.end() &&
-         "CanonicalGD is already mangled.");
   return MangledDeclNames[CanonicalGD] = Result.first->first();
 }