Generate the TransitionElementsStub using Crankshaft

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 b0f3f8dce452b32793b2782de6fe777f4ee3ee62..5a3947ef7f607c8577d43a58820a0dc594b41e42 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -3877,8 +3877,7 @@ void MacroAssembler::AllocateInNewSpace(Register object_size,
                                         Register scratch,
                                         Label* gc_required,
                                         AllocationFlags flags) {
-  ASSERT((flags & (DOUBLE_ALIGNMENT | RESULT_CONTAINS_TOP |
-                   SIZE_IN_WORDS)) == 0);
+  ASSERT((flags & (RESULT_CONTAINS_TOP | SIZE_IN_WORDS)) == 0);
   if (!FLAG_inline_new) {
     if (emit_debug_code()) {
       // Trash the registers to simulate an allocation failure.
@@ -3912,6 +3911,13 @@ void MacroAssembler::AllocateInNewSpace(Register object_size,
   // Update allocation top.
   UpdateAllocationTopHelper(result_end, scratch);
 
+  // Align the next allocation. Storing the filler map without checking top is
+  // always safe because the limit of the heap is always aligned.
+  if (((flags & DOUBLE_ALIGNMENT) != 0) && FLAG_debug_code) {
+    testq(result, Immediate(kDoubleAlignmentMask));
+    Check(zero, "Allocation is not double aligned");
+  }
+
   // Tag the result if requested.
   if ((flags & TAG_OBJECT) != 0) {
     addq(result, Immediate(kHeapObjectTag));
@@ -4606,8 +4612,7 @@ void MacroAssembler::CheckEnumCache(Register null_value, Label* call_runtime) {
 
 void MacroAssembler::TestJSArrayForAllocationSiteInfo(
     Register receiver_reg,
-    Register scratch_reg,
-    Label* allocation_info_present) {
+    Register scratch_reg) {
   Label no_info_available;
   ExternalReference new_space_start =
       ExternalReference::new_space_start(isolate());
@@ -4623,7 +4628,6 @@ void MacroAssembler::TestJSArrayForAllocationSiteInfo(
   j(greater, &no_info_available);
   CompareRoot(MemOperand(scratch_reg, -AllocationSiteInfo::kSize),
               Heap::kAllocationSiteInfoMapRootIndex);
-  j(equal, allocation_info_present);
   bind(&no_info_available);
 }