Add RTTIBuilder::GetAddrOfTypeName which uses the newly added CreateOrReplaceCXXRuntimeVariable.

Set the visibility for typeinfo names.

llvm-svn: 124548
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 88de91a..41f499e 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -199,6 +199,10 @@
   if (!CodeGenOpts.HiddenWeakVTables)
     return;
 
+  // We never want to drop the visibility for RTTI names.
+  if (TVK == TVK_ForRTTIName)
+    return;
+
   // We want to drop the visibility to hidden for weak type symbols.
   // This isn't possible if there might be unresolved references
   // elsewhere that rely on this symbol being visible.