Add write barrier helper for code patching and refactor stack check patching.

src/x64/deoptimizer-x64.cc

Index: src/x64/deoptimizer-x64.cc
===================================================================
--- src/x64/deoptimizer-x64.cc	(revision 9676)
+++ src/x64/deoptimizer-x64.cc	(working copy)
@@ -258,16 +258,13 @@
   Assembler::set_target_address_at(call_target_address,
                                    replacement_code->entry());
 
-  RelocInfo rinfo(call_target_address,
-                  RelocInfo::CODE_TARGET,
-                  0,
-                  unoptimized_code);
-  unoptimized_code->GetHeap()->incremental_marking()->RecordWriteIntoCode(
-      unoptimized_code, &rinfo, replacement_code);
+  unoptimized_code->GetHeap()->incremental_marking()->RecordCodeTargetPatch(
+      unoptimized_code, call_target_address, replacement_code);
 }
 
 
-void Deoptimizer::RevertStackCheckCodeAt(Address pc_after,
+void Deoptimizer::RevertStackCheckCodeAt(Code* unoptimized_code,
+                                         Address pc_after,
                                          Code* check_code,
                                          Code* replacement_code) {
   Address call_target_address = pc_after - kIntSize;
@@ -282,8 +279,9 @@
   *(call_target_address - 2) = 0x07;  // offset
   Assembler::set_target_address_at(call_target_address,
                                    check_code->entry());
-  check_code->GetHeap()->incremental_marking()->
-      RecordCodeTargetPatch(call_target_address, check_code);
+
+  check_code->GetHeap()->incremental_marking()->RecordCodeTargetPatch(
+      unoptimized_code, call_target_address, check_code);
 }