Subzero. ARM32. Adds an IsGPR attribute to the register tables.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4076
R=kschimpf@google.com

Review URL: https://codereview.chromium.org/1554203002 .
diff --git a/src/IceTargetLoweringARM32.cpp b/src/IceTargetLoweringARM32.cpp
index c0a2f57..abda21d 100644
--- a/src/IceTargetLoweringARM32.cpp
+++ b/src/IceTargetLoweringARM32.cpp
@@ -182,7 +182,7 @@
 namespace {
 constexpr SizeT NumGPRArgs =
 #define X(val, encode, name, cc_arg, scratch, preserved, stackptr, frameptr,   \
-          isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)              \
+          isGPR, isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)       \
   +(((cc_arg) > 0) ? 1 : 0)
     REGARM32_GPR_TABLE
 #undef X
@@ -191,7 +191,7 @@
 
 constexpr SizeT NumI64Args =
 #define X(val, encode, name, cc_arg, scratch, preserved, stackptr, frameptr,   \
-          isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)              \
+          isGPR, isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)       \
   +(((cc_arg) > 0) ? 1 : 0)
     REGARM32_I64PAIR_TABLE
 #undef X
@@ -200,7 +200,7 @@
 
 constexpr SizeT NumFP32Args =
 #define X(val, encode, name, cc_arg, scratch, preserved, stackptr, frameptr,   \
-          isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)              \
+          isGPR, isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)       \
   +(((cc_arg) > 0) ? 1 : 0)
     REGARM32_FP32_TABLE
 #undef X
@@ -209,7 +209,7 @@
 
 constexpr SizeT NumFP64Args =
 #define X(val, encode, name, cc_arg, scratch, preserved, stackptr, frameptr,   \
-          isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)              \
+          isGPR, isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)       \
   +(((cc_arg) > 0) ? 1 : 0)
     REGARM32_FP64_TABLE
 #undef X
@@ -218,7 +218,7 @@
 
 constexpr SizeT NumVec128Args =
 #define X(val, encode, name, cc_arg, scratch, preserved, stackptr, frameptr,   \
-          isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)              \
+          isGPR, isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)       \
   +(((cc_arg > 0)) ? 1 : 0)
     REGARM32_VEC128_TABLE
 #undef X
@@ -240,7 +240,7 @@
   llvm::SmallBitVector InvalidRegisters(RegARM32::Reg_NUM);
   ScratchRegs.resize(RegARM32::Reg_NUM);
 #define X(val, encode, name, cc_arg, scratch, preserved, stackptr, frameptr,   \
-          isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)              \
+          isGPR, isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)       \
   IntegerRegisters[RegARM32::val] = isInt;                                     \
   I64PairRegisters[RegARM32::val] = isI64Pair;                                 \
   Float32Registers[RegARM32::val] = isFP32;                                    \
@@ -829,7 +829,7 @@
 
 const char *RegARM32::RegNames[] = {
 #define X(val, encode, name, cc_arg, scratch, preserved, stackptr, frameptr,   \
-          isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)              \
+          isGPR, isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)       \
   name,
     REGARM32_TABLE
 #undef X
@@ -844,7 +844,7 @@
 Variable *TargetARM32::getPhysicalRegister(SizeT RegNum, Type Ty) {
   static const Type DefaultType[] = {
 #define X(val, encode, name, cc_arg, scratch, preserved, stackptr, frameptr,   \
-          isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)              \
+          isGPR, isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)       \
   (isFP32)                                                                     \
       ? IceType_f32                                                            \
       : ((isFP64) ? IceType_f64 : ((isVec128 ? IceType_v4i32 : IceType_i32))),
@@ -1835,7 +1835,7 @@
   llvm::SmallBitVector Registers(RegARM32::Reg_NUM);
 
 #define X(val, encode, name, cc_arg, scratch, preserved, stackptr, frameptr,   \
-          isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)              \
+          isGPR, isInt, isI64Pair, isFP32, isFP64, isVec128, alias_init)       \
   if (scratch && (Include & RegSet_CallerSave))                                \
     Registers[RegARM32::val] = true;                                           \
   if (preserved && (Include & RegSet_CalleeSave))                              \