[WebAssembly] Use MCRegister::id(). NFC (#167609)

Author: topperc

llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyInstPrinter.cpp

@@ -317,8 +317,8 @@ void WebAssemblyInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
   const MCOperand &Op = MI->getOperand(OpNo);
   if (Op.isReg()) {
     const MCInstrDesc &Desc = MII.get(MI->getOpcode());
-    unsigned WAReg = Op.getReg();
-    if (int(WAReg) >= 0)
+    MCRegister WAReg = Op.getReg();
+    if (int(WAReg.id()) >= 0)
       printRegName(O, WAReg);
     else if (OpNo >= Desc.getNumDefs() && !IsVariadicDef)
       O << "$pop" << WebAssembly::getWARegStackId(WAReg);

llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h

@@ -608,9 +608,9 @@ inline bool isLocalTee(unsigned Opc) {
 static const unsigned UnusedReg = -1u;
 
 // For a given stackified WAReg, return the id number to print with push/pop.
-unsigned inline getWARegStackId(unsigned Reg) {
-  assert(Reg & INT32_MIN);
-  return Reg & INT32_MAX;
+unsigned inline getWARegStackId(MCRegister Reg) {
+  assert(Reg.id() & INT32_MIN);
+  return Reg.id() & INT32_MAX;
 }
 
 } // end namespace WebAssembly