Merge bleeding edge up to 8774 into the GC branch.

src/ia32/macro-assembler-ia32.cc

 // Copyright 2011 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 330 matching lines @@
 void MacroAssembler::SafePush(const Immediate& x) {
   if (IsUnsafeImmediate(x) && jit_cookie() != 0) {
     push(Immediate(x.x_ ^ jit_cookie()));
     xor_(Operand(esp, 0), Immediate(jit_cookie()));
   } else {
     push(x);
   }
 }
 
 
+void MacroAssembler::CompareRoot(Register with, Heap::RootListIndex index) {
+  // see ROOT_ACCESSOR macro in factory.h
+  Handle<Object> value(&isolate()->heap()->roots_address()[index]);
+  cmp(with, value);
+}
+
+
 void MacroAssembler::CmpObjectType(Register heap_object,
                                    InstanceType type,
                                    Register map) {
   mov(map, FieldOperand(heap_object, HeapObject::kMapOffset));
   CmpInstanceType(map, type);
 }
 
 
 void MacroAssembler::CmpInstanceType(Register map, InstanceType type) {
   cmpb(FieldOperand(map, Map::kInstanceTypeOffset),
@@ skipping 1761 matching lines @@
 
 
 void MacroAssembler::AssertFastElements(Register elements) {
   if (emit_debug_code()) {
     Factory* factory = isolate()->factory();
     Label ok;
     cmp(FieldOperand(elements, HeapObject::kMapOffset),
         Immediate(factory->fixed_array_map()));
     j(equal, &ok);
     cmp(FieldOperand(elements, HeapObject::kMapOffset),
+        Immediate(factory->fixed_double_array_map()));
+    j(equal, &ok);
+    cmp(FieldOperand(elements, HeapObject::kMapOffset),
         Immediate(factory->fixed_cow_array_map()));
     j(equal, &ok);
     Abort("JSObject with fast elements map has slow elements");
     bind(&ok);
   }
 }
 
 
 void MacroAssembler::Check(Condition cc, const char* msg) {
   Label L;
@@ skipping 370 matching lines @@
   and_(bitmap_scratch, Immediate(~Page::kPageAlignmentMask));
   add(Operand(bitmap_scratch, MemoryChunk::kLiveBytesOffset),
       length);
 
   bind(&done);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32