Subzero: Use a proper RegNumT type instead of int32_t/SizeT.

src/IceInstARM32.cpp

Index: src/IceInstARM32.cpp
diff --git a/src/IceInstARM32.cpp b/src/IceInstARM32.cpp
index 6b9c5a0ab545e4fb4f66b07bfa0f88bac954a908..e6b0f5f0d52af401abdbc6787810183d3b304185 100644
--- a/src/IceInstARM32.cpp
+++ b/src/IceInstARM32.cpp
@@ -888,13 +888,13 @@ void InstARM32RegisterStackOp::emitSRegsAsText(const Cfg *Func,
   Ostream &Str = Func->getContext()->getStrEmit();
   Str << "\t" << getSRegOpcode() << "\t{";
   bool IsFirst = true;
-  int32_t Base = BaseReg->getRegNum();
+  RegNumT Base = BaseReg->getRegNum();
   for (SizeT i = 0; i < RegCount; ++i) {
     if (IsFirst)
       IsFirst = false;
     else
       Str << ", ";
-    Str << RegARM32::getRegName(Base + i);
+    Str << RegARM32::getRegName(RegNumT::fixme(Base + i));
   }
   Str << "}";
 }
@@ -905,7 +905,7 @@ bool isAssignedConsecutiveRegisters(const Variable *Before,
                                     const Variable *After) {
   assert(Before->hasReg());
   assert(After->hasReg());
-  return Before->getRegNum() + 1 == After->getRegNum();
+  return RegNumT::fixme(Before->getRegNum() + 1) == After->getRegNum();
 }
 
 } // end of anonymous namespace
@@ -924,7 +924,7 @@ void InstARM32RegisterStackOp::emitUsingForm(const Cfg *Func,
     for (SizeT i = 0; i < NumRegs; ++i) {
       const Variable *Var = getStackReg(i);
       assert(Var->hasReg() && "stack op only applies to registers");
-      int32_t Reg = RegARM32::getEncodedGPR(Var->getRegNum());
+      RegARM32::GPRRegister Reg = RegARM32::getEncodedGPR(Var->getRegNum());
       LastDest = Var;
       GPRegisters |= (1 << Reg);
       ++IntegerCount;