add getNumLowBitsAvailable for OpaquePtr and QualType.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67975 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/AST/Type.h

@@ -233,6 +233,8 @@ public:
   static inline clang::QualType getFromVoidPointer(void *P) {
     return clang::QualType::getFromOpaquePtr(P);
   }
+  // CVR qualifiers go in low bits.
+  static inline unsigned getNumLowBitsAvailable() { return 0; }
 };
 } // end namespace llvm
 

include/clang/Parse/Ownership.h

@@ -57,6 +57,7 @@ namespace llvm {
     static inline clang::OpaquePtr<UID> getFromVoidPointer(void *P) {
       return clang::OpaquePtr<UID>::make(P);
     }
+    static inline unsigned getNumLowBitsAvailable() { return 3; }
   };
 }