Remove HLoadElements instruction and replace with use of more general HLoadNamedField.

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 61eb7d13c14d4d67e8f3c10e1407497ea9b77e69..c8522ea0bba320abc8344bbbf6ea6a0ceab5768a 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -2854,41 +2854,6 @@ void LCodeGen::DoLoadFunctionPrototype(LLoadFunctionPrototype* instr) {
 }
 
 
-void LCodeGen::DoLoadElements(LLoadElements* instr) {
-  Register result = ToRegister(instr->result());
-  Register input = ToRegister(instr->object());
-  __ movq(result, FieldOperand(input, JSObject::kElementsOffset));
-  if (FLAG_debug_code) {
-    Label done, ok, fail;
-    __ CompareRoot(FieldOperand(result, HeapObject::kMapOffset),
-                   Heap::kFixedArrayMapRootIndex);
-    __ j(equal, &done, Label::kNear);
-    __ CompareRoot(FieldOperand(result, HeapObject::kMapOffset),
-                   Heap::kFixedCOWArrayMapRootIndex);
-    __ j(equal, &done, Label::kNear);
-    Register temp((result.is(rax)) ? rbx : rax);
-    __ push(temp);
-    __ movq(temp, FieldOperand(result, HeapObject::kMapOffset));
-    __ movzxbq(temp, FieldOperand(temp, Map::kBitField2Offset));
-    __ and_(temp, Immediate(Map::kElementsKindMask));
-    __ shr(temp, Immediate(Map::kElementsKindShift));
-    __ cmpl(temp, Immediate(GetInitialFastElementsKind()));
-    __ j(less, &fail, Label::kNear);
-    __ cmpl(temp, Immediate(TERMINAL_FAST_ELEMENTS_KIND));
-    __ j(less_equal, &ok, Label::kNear);
-    __ cmpl(temp, Immediate(FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND));
-    __ j(less, &fail, Label::kNear);
-    __ cmpl(temp, Immediate(LAST_EXTERNAL_ARRAY_ELEMENTS_KIND));
-    __ j(less_equal, &ok, Label::kNear);
-    __ bind(&fail);
-    __ Abort("Check for fast or external elements failed");
-    __ bind(&ok);
-    __ pop(temp);
-    __ bind(&done);
-  }
-}
-
-
 void LCodeGen::DoLoadExternalArrayPointer(
     LLoadExternalArrayPointer* instr) {
   Register result = ToRegister(instr->result());