Support verified heap pointer writes on ia32.

runtime/vm/code_patcher_ia32.cc

Index: runtime/vm/code_patcher_ia32.cc
===================================================================
--- runtime/vm/code_patcher_ia32.cc	(revision 41609)
+++ runtime/vm/code_patcher_ia32.cc	(working copy)
@@ -9,6 +9,7 @@
 #include "vm/code_patcher.h"
 #include "vm/cpu.h"
 #include "vm/dart_entry.h"
+#include "vm/flow_graph_compiler.h"
 #include "vm/instructions.h"
 #include "vm/object.h"
 #include "vm/raw_object.h"
@@ -275,7 +276,7 @@
 class EdgeCounter : public ValueObject {
  public:
   EdgeCounter(uword pc, const Code& ignored)
-      : end_(pc - CodePatcher::EdgeCounterIncrementSizeInBytes()) {
+      : end_(pc - FlowGraphCompiler::EdgeCounterIncrementSizeInBytes()) {
     ASSERT(IsValid(end_));
   }
 
@@ -292,14 +293,6 @@
 };
 
 
-int32_t CodePatcher::EdgeCounterIncrementSizeInBytes() {
-  // The edge counter load is followed by the fixed-size edge counter
-  // incrementing code:
-  //     83 40 0b 02               add [eax+0xb],0x2
-  return 4;
-}
-
-
 RawObject* CodePatcher::GetEdgeCounterAt(uword pc, const Code& code) {
   ASSERT(code.ContainsInstructionAt(pc));
   EdgeCounter counter(pc, code);