Introduce a stack of instantiation scopes that are used to store the mapping from variable declarations that occur within templates to their instantiated counterparts

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@71799 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/Sema.cpp b/lib/Sema/Sema.cpp
index b931cf8..411d5a1 100644
--- a/lib/Sema/Sema.cpp
+++ b/lib/Sema/Sema.cpp
@@ -182,7 +182,8 @@
     ExternalSource(0), CurContext(0), PreDeclaratorDC(0),
     CurBlock(0), PackContext(0), IdResolver(pp.getLangOptions()),
     GlobalNewDeleteDeclared(false), 
-    CompleteTranslationUnit(CompleteTranslationUnit) {
+    CompleteTranslationUnit(CompleteTranslationUnit),
+    CurrentInstantiationScope(0) {
   
   StdNamespace = 0;
   TUScope = 0;