WIP: Add ARM32 add/ldr/str instructions and operand types.

src/IceTargetLoweringARM32.cpp

Index: src/IceTargetLoweringARM32.cpp
diff --git a/src/IceTargetLoweringARM32.cpp b/src/IceTargetLoweringARM32.cpp
index d65b5469c18c7f6b175b9a916c9474ec7bc37e6b..25c6f2bd90c0a4a5b5173dcbf52ae3c0be27a7ad 100644
--- a/src/IceTargetLoweringARM32.cpp
+++ b/src/IceTargetLoweringARM32.cpp
@@ -542,8 +542,6 @@ void TargetARM32::lowerArithmetic(const InstArithmetic *Inst) {
   // E.g., use BIC (bit clear) instead of AND for some masks.
   Variable *Src0 = legalizeToVar(Inst->getSrc(0));
   Operand *Src1 = legalize(Inst->getSrc(1), Legal_Reg | Legal_Flex);
-  (void)Src0;
-  (void)Src1;
   if (Dest->getType() == IceType_i64) {
     UnimplementedError(Func->getContext()->getFlags());
   } else if (isVectorType(Dest->getType())) {
@@ -554,10 +552,9 @@ void TargetARM32::lowerArithmetic(const InstArithmetic *Inst) {
       llvm_unreachable("Unknown arithmetic operator");
       break;
     case InstArithmetic::Add: {
-      UnimplementedError(Func->getContext()->getFlags());
-      // Variable *T = makeReg(Dest->getType());
-      // _add(T, Src0, Src1);
-      // _mov(Dest, T);
+      Variable *T = makeReg(Dest->getType());
+      _add(T, Src0, Src1);
+      _mov(Dest, T);
     } break;
     case InstArithmetic::And:
       UnimplementedError(Func->getContext()->getFlags());