Reland "Fixed environment assignment for LCheckNonSmi."

Now with (hopefully correct) ARM64 part... :-}

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/225313003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20495 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/lithium-arm.cc

@@ -1963,7 +1963,9 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
 
 LInstruction* LChunkBuilder::DoCheckHeapObject(HCheckHeapObject* instr) {
   LOperand* value = UseRegisterAtStart(instr->value());
-  return AssignEnvironment(new(zone()) LCheckNonSmi(value));
+  LInstruction* result = new(zone()) LCheckNonSmi(value);
+  if (!instr->value()->IsHeapObject()) result = AssignEnvironment(result);
+  return result;
 }
 
 

src/arm64/lithium-arm64.cc

@@ -1202,7 +1202,9 @@ LInstruction* LChunkBuilder::DoCheckMaps(HCheckMaps* instr) {
 
 LInstruction* LChunkBuilder::DoCheckHeapObject(HCheckHeapObject* instr) {
   LOperand* value = UseRegisterAtStart(instr->value());
-  return AssignEnvironment(new(zone()) LCheckNonSmi(value));
+  LInstruction* result = new(zone()) LCheckNonSmi(value);
+  if (!instr->value()->IsHeapObject()) result = AssignEnvironment(result);
+  return result;
 }
 
 

src/ia32/lithium-ia32.cc

@@ -2007,7 +2007,9 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
 
 LInstruction* LChunkBuilder::DoCheckHeapObject(HCheckHeapObject* instr) {
   LOperand* value = UseAtStart(instr->value());
-  return AssignEnvironment(new(zone()) LCheckNonSmi(value));
+  LInstruction* result = new(zone()) LCheckNonSmi(value);
+  if (!instr->value()->IsHeapObject()) result = AssignEnvironment(result);
+  return result;
 }
 
 

src/x64/lithium-x64.cc

@@ -1925,7 +1925,9 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
 
 LInstruction* LChunkBuilder::DoCheckHeapObject(HCheckHeapObject* instr) {
   LOperand* value = UseRegisterAtStart(instr->value());
-  return AssignEnvironment(new(zone()) LCheckNonSmi(value));
+  LInstruction* result = new(zone()) LCheckNonSmi(value);
+  if (!instr->value()->IsHeapObject()) result = AssignEnvironment(result);
+  return result;
 }