Remove support for smi-based keyed accesses on 64bit.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index c1d81c08717b2364a4ff5180408d72418ed7a3de..d6f05c0a2df80bf90531fda2ed89aae021f9c442 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -2118,13 +2118,9 @@ LInstruction* LChunkBuilder::DoLoadExternalArrayPointer(
 
 
 LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
-  ASSERT(instr->key()->representation().IsInteger32() ||
-         instr->key()->representation().IsSmi());
+  ASSERT(instr->key()->representation().IsInteger32());
   ElementsKind elements_kind = instr->elements_kind();
-  bool clobbers_key = instr->key()->representation().IsSmi();
-  LOperand* key = clobbers_key
-      ? UseTempRegister(instr->key())
-      : UseRegisterOrConstantAtStart(instr->key());
+  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
   LLoadKeyed* result = NULL;
 
   if (!instr->is_external()) {
@@ -2162,7 +2158,6 @@ LInstruction* LChunkBuilder::DoLoadKeyedGeneric(HLoadKeyedGeneric* instr) {
 
 LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
   ElementsKind elements_kind = instr->elements_kind();
-  bool clobbers_key = instr->key()->representation().IsSmi();
 
   if (!instr->is_external()) {
     ASSERT(instr->elements()->representation().IsTagged());
@@ -2174,8 +2169,7 @@ LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
     if (instr->value()->representation().IsDouble()) {
       object = UseRegisterAtStart(instr->elements());
       val = UseTempRegister(instr->value());
-      key = clobbers_key ? UseTempRegister(instr->key())
-          : UseRegisterOrConstantAtStart(instr->key());
+      key = UseRegisterOrConstantAtStart(instr->key());
     } else {
       ASSERT(instr->value()->representation().IsSmiOrTagged());
       object = UseTempRegister(instr->elements());
@@ -2184,12 +2178,7 @@ LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
         key = UseTempRegister(instr->key());
       } else {
         val = UseRegisterOrConstantAtStart(instr->value());
-
-        if (clobbers_key) {
-          key = UseTempRegister(instr->key());
-        } else {
-          key = UseRegisterOrConstantAtStart(instr->key());
-        }
+        key = UseRegisterOrConstantAtStart(instr->key());
       }
     }
 
@@ -2209,8 +2198,7 @@ LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
       elements_kind == EXTERNAL_FLOAT_ELEMENTS;
   LOperand* val = val_is_temp_register ? UseTempRegister(instr->value())
       : UseRegister(instr->value());
-  LOperand* key = clobbers_key ? UseTempRegister(instr->key())
-      : UseRegisterOrConstantAtStart(instr->key());
+  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
   LOperand* external_pointer = UseRegister(instr->elements());
   return new(zone()) LStoreKeyed(external_pointer, key, val);
 }