fixup! Address review comments.

Author: topperc

llvm/include/llvm/CodeGen/RDFRegisters.h

@@ -87,8 +87,8 @@ template <typename T, unsigned N = 32> struct IndexedSet {
 
 struct RegisterRef {
 private:
-  static constexpr unsigned MaskFlag = 1u << 30;
-  static constexpr unsigned UnitFlag = 1u << 31;
+  static constexpr RegisterId MaskFlag = 1u << 30;
+  static constexpr RegisterId UnitFlag = 1u << 31;
 
 public:
   RegisterId Reg = 0;
@@ -114,7 +114,7 @@ struct RegisterRef {
     return Reg & ~UnitFlag;
   }
 
-  constexpr unsigned getMaskIdx() const {
+  constexpr unsigned asMaskIdx() const {
     assert(isMask());
     return toMaskIdx(Reg);
   }

llvm/lib/CodeGen/RDFRegisters.cpp

@@ -260,7 +260,7 @@ void PhysicalRegisterInfo::print(raw_ostream &OS, RegisterRef A) const {
   } else if (A.isUnit()) {
     OS << printRegUnit(A.asMCRegUnit(), &TRI);
   } else {
-    unsigned Idx = A.getMaskIdx();
+    unsigned Idx = A.asMaskIdx();
     const char *Fmt = Idx < 0x10000 ? "%04x" : "%08x";
     OS << "M#" << format(Fmt, Idx);
   }