Reduce the amount of full code generated to fill out array literals.

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index 40025d343764459272edb2e1e4e4b862ab3707da..8868c7a88adc6c9136d66e29ddce79e837a05ac7 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -6636,11 +6636,11 @@ void RecordWriteStub::CheckNeedsToInformIncrementalMarker(
 void StoreArrayLiteralElementStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- rax    : element value to store
-  //  -- rbx    : array literal
-  //  -- rdi    : map of array literal
   //  -- rcx    : element index as smi
-  //  -- rdx    : array literal index in function
   //  -- rsp[0] : return address
+  //  -- rsp[8] : array literal index in function
+  //  -- rsp[16]: array literal
+  // clobbers rbx, rdx, rdi
   // -----------------------------------
 
   Label element_done;
@@ -6649,6 +6649,11 @@ void StoreArrayLiteralElementStub::Generate(MacroAssembler* masm) {
   Label slow_elements;
   Label fast_elements;
 
+  // Get array literal index, array literal and its map.
+  __ movq(rdx, Operand(rsp, 1 * kPointerSize));
+  __ movq(rbx, Operand(rsp, 2 * kPointerSize));
+  __ movq(rdi, FieldOperand(rbx, JSObject::kMapOffset));
+
   __ CheckFastElements(rdi, &double_elements);
 
   // FAST_*_SMI_ELEMENTS or FAST_*_ELEMENTS