Fix the following bug submitted by Ted Kremenek:

void func() {
int xx = xx; // incorrectly diagnosed 'xx' as an undeclared identifier.
}

This smallish bug resulted in a largish fix. Here are some highlights:

- Needed to make sure ParseDeclarator is called *before* parsing any
initializer. Removed the "Init" argument to ParseDeclarator.
- Added AddInitializerToDecl() to the Action & Sema classes.
In Sema, this hook is responsible for validating the initializer and
installing it into the respective decl.
- Moved several semantic checks from ParseDeclarator() to 
FinalizeDeclaratorGroup(). Previously, this hook was only responsible for 
reversing a list. Now it plays a much larger semantic role. 

All of the above changes ended up simplifying ParseDeclarator(), which
is goodness...



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41877 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Parse/Parser.cpp b/Parse/Parser.cpp
index da1bb52..21ef54d 100644
--- a/Parse/Parser.cpp
+++ b/Parse/Parser.cpp
@@ -242,7 +242,7 @@
     
     Declarator D(DS, Declarator::FileContext);
     D.SetIdentifier(PP.getIdentifierInfo("__builtin_va_list"),SourceLocation());
-    Actions.ParseDeclarator(CurScope, D, 0, 0);
+    Actions.ParseDeclarator(CurScope, D, 0);
   }
   
   if (Tok.getKind() == tok::eof &&