Changed VarDecl::hasGlobalStorage() to be the negation of hasLocalStorage().

Before it was the negation of hasAutoStorage(), which is incorrect. 
"Register" storage for Decls do not indicate global variables.

llvm-svn: 47630

Author: tkremenek

clang/include/clang/AST/Decl.h

@@ -329,7 +329,7 @@ class VarDecl : public ValueDecl {
   /// hasGlobalStorage - Returns true for all variables that do not
   ///  have local storage.  This includs all global variables as well
   ///  as static variables declared within a function.
-  bool hasGlobalStorage() const { return !hasAutoStorage(); }
+  bool hasGlobalStorage() const { return !hasLocalStorage(); }
 
   // Implement isa/cast/dyncast/etc.
   static bool classof(const Decl *D) {