Remove the compiled_transitions flag and cleanup the unused code.

src/x64/lithium-codegen-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4270 matching lines @@
   __ Cmp(FieldOperand(object_reg, HeapObject::kMapOffset), from_map);
   __ j(not_equal, &not_applicable);
   if (IsSimpleMapChangeTransition(from_kind, to_kind)) {
     Register new_map_reg = ToRegister(instr->new_map_temp());
     __ movq(new_map_reg, to_map, RelocInfo::EMBEDDED_OBJECT);
     __ movq(FieldOperand(object_reg, HeapObject::kMapOffset), new_map_reg);
     // Write barrier.
     ASSERT_NE(instr->temp(), NULL);
     __ RecordWriteField(object_reg, HeapObject::kMapOffset, new_map_reg,
                         ToRegister(instr->temp()), kDontSaveFPRegs);
-  } else if (FLAG_compiled_transitions) {
+  } else {
     PushSafepointRegistersScope scope(this);
     if (!object_reg.is(rax)) {
       __ movq(rax, object_reg);
     }
     __ Move(rbx, to_map);
     TransitionElementsKindStub stub(from_kind, to_kind);
     __ CallStub(&stub);
     RecordSafepointWithRegisters(
         instr->pointer_map(), 0, Safepoint::kNoLazyDeopt);
-  } else if (IsFastSmiElementsKind(from_kind) &&
-            IsFastDoubleElementsKind(to_kind)) {
-    Register fixed_object_reg = ToRegister(instr->temp());
-    ASSERT(fixed_object_reg.is(rdx));
-    Register new_map_reg = ToRegister(instr->new_map_temp());
-    ASSERT(new_map_reg.is(rbx));
-    __ movq(new_map_reg, to_map, RelocInfo::EMBEDDED_OBJECT);
-    __ movq(fixed_object_reg, object_reg);
-    CallCode(isolate()->builtins()->TransitionElementsSmiToDouble(),
-             RelocInfo::CODE_TARGET, instr);
-  } else if (IsFastDoubleElementsKind(from_kind) &&
-             IsFastObjectElementsKind(to_kind)) {
-    Register fixed_object_reg = ToRegister(instr->temp());
-    ASSERT(fixed_object_reg.is(rdx));
-    Register new_map_reg = ToRegister(instr->new_map_temp());
-    ASSERT(new_map_reg.is(rbx));
-    __ movq(new_map_reg, to_map, RelocInfo::EMBEDDED_OBJECT);
-    __ movq(fixed_object_reg, object_reg);
-    CallCode(isolate()->builtins()->TransitionElementsDoubleToObject(),
-             RelocInfo::CODE_TARGET, instr);
-  } else {
-    UNREACHABLE();
   }
   __ bind(&not_applicable);
 }
 
 
 void LCodeGen::DoTrapAllocationMemento(LTrapAllocationMemento* instr) {
   Register object = ToRegister(instr->object());
   Register temp = ToRegister(instr->temp());
   __ TestJSArrayForAllocationMemento(object, temp);
   DeoptimizeIf(equal, instr->environment());
@@ skipping 1226 matching lines @@
                                FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64