Support array literals with FAST_DOUBLE_ELEMENTS ElementsKind.

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index f9459dd3e1be9f088a634df0b40c06ec8744960b..1335a97ef16071740e594489a5c8f0b2a8fe7c25 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -2724,7 +2724,7 @@ void MacroAssembler::CheckFastSmiOnlyElements(Register map,
 void MacroAssembler::StoreNumberToDoubleElements(
     Register maybe_number,
     Register elements,
-    Register key,
+    Register index,
     XMMRegister xmm_scratch,
     Label* fail) {
   Label smi_value, is_nan, maybe_nan, not_nan, have_double_value, done;
@@ -2745,7 +2745,7 @@ void MacroAssembler::StoreNumberToDoubleElements(
   bind(&not_nan);
   movsd(xmm_scratch, FieldOperand(maybe_number, HeapNumber::kValueOffset));
   bind(&have_double_value);
-  movsd(FieldOperand(elements, key, times_8, FixedDoubleArray::kHeaderSize),
+  movsd(FieldOperand(elements, index, times_8, FixedDoubleArray::kHeaderSize),
         xmm_scratch);
   jmp(&done);
 
@@ -2768,7 +2768,7 @@ void MacroAssembler::StoreNumberToDoubleElements(
   // Preserve original value.
   SmiToInteger32(kScratchRegister, maybe_number);
   cvtlsi2sd(xmm_scratch, kScratchRegister);
-  movsd(FieldOperand(elements, key, times_8, FixedDoubleArray::kHeaderSize),
+  movsd(FieldOperand(elements, index, times_8, FixedDoubleArray::kHeaderSize),
         xmm_scratch);
   bind(&done);
 }