Subzero: Prototype to make use of RegNumT::No Register more concise

src/IceOperand.cpp

Index: src/IceOperand.cpp
diff --git a/src/IceOperand.cpp b/src/IceOperand.cpp
index ada16068337ebe8c78bef412e2827c1ce89ae5a6..beb14e554742c7635a3e612f90040b5fe5b02749 100644
--- a/src/IceOperand.cpp
+++ b/src/IceOperand.cpp
@@ -201,7 +201,7 @@ const Variable *Variable::asType(Type Ty, RegNumT NewRegNum) const {
   Variable *V = new (getCurrentCfgAllocator()->Allocate<Variable>())
       Variable(kVariable, Ty, Number);
   V->NameIndex = NameIndex;
-  V->RegNum = NewRegNum == RegNumT::NoRegister ? RegNum : NewRegNum;
+  V->RegNum = NewRegNum.hasNoValue() ? RegNum : NewRegNum;

[Jim Stichnoth, 2016/02/12 18:29:54]

NewRegNum.hasValue() ? NewRegNum : RegNum

similar to how
  if (c) a(); else b();
is preferred over
  if (!c) b(); else a();

[rkotlerimgtec, 2016/02/12 22:02:01]

Done.

   V->StackOffset = StackOffset;
   return V;
 }