Fix the GC branch so it compiles and runs on 64 bit.

src/x64/assembler-x64-inl.h

Index: src/x64/assembler-x64-inl.h
===================================================================
--- src/x64/assembler-x64-inl.h	(revision 7889)
+++ src/x64/assembler-x64-inl.h	(working copy)
@@ -238,10 +238,15 @@
 }
 
 
-void RelocInfo::set_target_address(Address target) {
+void RelocInfo::set_target_address(Address target, Code* code) {
   ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
   if (IsCodeTarget(rmode_)) {
     Assembler::set_target_address_at(pc_, target);
+    Object* target_code = Code::GetCodeFromTargetAddress(target);
+    if (code != NULL) {
+      code->GetHeap()->incremental_marking()->RecordWrite(
+          code, HeapObject::cast(target_code));
+    }
   } else {
     Memory::Address_at(pc_) = target;
     CPU::FlushICache(pc_, sizeof(Address));
@@ -277,10 +282,14 @@
 }
 
 
-void RelocInfo::set_target_object(Object* target) {
+void RelocInfo::set_target_object(Object* target, Code* code) {
   ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   *reinterpret_cast<Object**>(pc_) = target;
   CPU::FlushICache(pc_, sizeof(Address));
+  if (code != NULL && target->IsHeapObject()) {
+    code->GetHeap()->incremental_marking()->RecordWrite(
+        code, HeapObject::cast(target));
+  }
 }
 
 
@@ -301,11 +310,14 @@
 }
 
 
-void RelocInfo::set_target_cell(JSGlobalPropertyCell* cell) {
+void RelocInfo::set_target_cell(JSGlobalPropertyCell* cell, Code* code) {
   ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
   Address address = cell->address() + JSGlobalPropertyCell::kValueOffset;
   Memory::Address_at(pc_) = address;
   CPU::FlushICache(pc_, sizeof(Address));
+  if (code != NULL) {
+    code->GetHeap()->incremental_marking()->RecordWrite(code, cell);
+  }
 }