Refactor the representation of qualifiers to bring ExtQualType out of the

Type hierarchy.  Demote 'volatile' to extended-qualifier status.  Audit our
use of qualifiers and fix a few places that weren't dealing with qualifiers
quite right;  many more remain.

llvm-svn: 82705

clang/lib/CodeGen/CodeGenFunction.h

@@ -496,6 +496,12 @@ public:
   //                                  Helpers
   //===--------------------------------------------------------------------===//
 
+  Qualifiers MakeQualifiers(QualType T) {
+    Qualifiers Quals = T.getQualifiers();
+    Quals.setObjCGCAttr(getContext().getObjCGCAttrKind(T));
+    return Quals;
+  }
+
   /// CreateTempAlloca - This creates a alloca and inserts it into the entry
   /// block.
   llvm::AllocaInst *CreateTempAlloca(const llvm::Type *Ty,