Refactor HType to get rid of various hacks.

src/arm64/lithium-codegen-arm64.cc

Index: src/arm64/lithium-codegen-arm64.cc
diff --git a/src/arm64/lithium-codegen-arm64.cc b/src/arm64/lithium-codegen-arm64.cc
index 8ffbbc5636f989a2a17f0d64568a1641302ebeed..ef492a66ea25fed1954c69c5747e36eaf2125fe3 100644
--- a/src/arm64/lithium-codegen-arm64.cc
+++ b/src/arm64/lithium-codegen-arm64.cc
@@ -2186,7 +2186,7 @@ void LCodeGen::DoCheckMaps(LCheckMaps* instr) {
 
 
 void LCodeGen::DoCheckNonSmi(LCheckNonSmi* instr) {
-  if (!instr->hydrogen()->value()->IsHeapObject()) {
+  if (!instr->hydrogen()->value()->type().IsHeapObject()) {
     DeoptimizeIfSmi(ToRegister(instr->value()), instr->environment());
   }
 }
@@ -2989,7 +2989,7 @@ void LCodeGen::DoHasInstanceTypeAndBranch(LHasInstanceTypeAndBranch* instr) {
   Register input = ToRegister(instr->value());
   Register scratch = ToRegister(instr->temp());
 
-  if (!instr->hydrogen()->value()->IsHeapObject()) {
+  if (!instr->hydrogen()->value()->type().IsHeapObject()) {
     __ JumpIfSmi(input, instr->FalseLabel(chunk_));
   }
   __ CompareObjectType(input, scratch, scratch, TestType(instr->hydrogen()));
@@ -3243,7 +3243,7 @@ void LCodeGen::DoIsStringAndBranch(LIsStringAndBranch* instr) {
   Register scratch = ToRegister(instr->temp());
 
   SmiCheck check_needed =
-      instr->hydrogen()->value()->IsHeapObject()
+      instr->hydrogen()->value()->type().IsHeapObject()
           ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
   Condition true_cond =
       EmitIsString(val, scratch, instr->FalseLabel(chunk_), check_needed);
@@ -3263,7 +3263,7 @@ void LCodeGen::DoIsUndetectableAndBranch(LIsUndetectableAndBranch* instr) {
   Register input = ToRegister(instr->value());
   Register temp = ToRegister(instr->temp());
 
-  if (!instr->hydrogen()->value()->IsHeapObject()) {
+  if (!instr->hydrogen()->value()->type().IsHeapObject()) {
     __ JumpIfSmi(input, instr->FalseLabel(chunk_));
   }
   __ Ldr(temp, FieldMemOperand(input, HeapObject::kMapOffset));
@@ -5090,7 +5090,7 @@ void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
   __ Str(value, target);
   if (instr->hydrogen()->NeedsWriteBarrier()) {
     SmiCheck check_needed =
-        instr->hydrogen()->value()->IsHeapObject()
+        instr->hydrogen()->value()->type().IsHeapObject()
             ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
     __ RecordWriteContextSlot(context,
                               target.offset(),
@@ -5284,7 +5284,7 @@ void LCodeGen::DoStoreKeyedFixed(LStoreKeyedFixed* instr) {
     // This assignment may cause element_addr to alias store_base.
     Register element_addr = scratch;
     SmiCheck check_needed =
-        instr->hydrogen()->value()->IsHeapObject()
+        instr->hydrogen()->value()->type().IsHeapObject()
             ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
     // Compute address of modified element and store it into key register.
     __ Add(element_addr, mem_op.base(), mem_op.OffsetAsOperand());