Avoid flushing the icache unnecessarily when updating target addresses in code.

src/ic.h

Index: src/ic.h
diff --git a/src/ic.h b/src/ic.h
index 197c32e6a55515c787628bab1ac5c91bc5df1cd1..5c497913395cf86ff67432f8496b0285eef179a9 100644
--- a/src/ic.h
+++ b/src/ic.h
@@ -160,11 +160,12 @@ class IC {
   Code* GetOriginalCode() const;
 
   // Set the call-site target.
-  void set_target(Code* code) {
+  void set_target(Code* code,
+                  ICacheFlushMode icache_flush_mode = FLUSH_ICACHE_IF_NEEDED) {
 #ifdef VERIFY_HEAP
     code->VerifyEmbeddedObjectsDependency();
 #endif
-    SetTargetAtAddress(address(), code, constant_pool());
+    SetTargetAtAddress(address(), code, constant_pool(), icache_flush_mode);
     target_set_ = true;
   }
 
@@ -186,7 +187,9 @@ class IC {
                                          ConstantPoolArray* constant_pool);
   static inline void SetTargetAtAddress(Address address,
                                         Code* target,
-                                        ConstantPoolArray* constant_pool);
+                                        ConstantPoolArray* constant_pool,
+                                        ICacheFlushMode icache_flush_mode =
+                                            FLUSH_ICACHE_IF_NEEDED);
   static void PostPatching(Address address, Code* target, Code* old_target);
 
   // Compute the handler either by compiling or by retrieving a cached version.
@@ -455,12 +458,13 @@ class LoadIC: public IC {
  protected:
   virtual Code::Kind kind() const { return Code::LOAD_IC; }
 
-  void set_target(Code* code) {
+  void set_target(Code* code,
+                  ICacheFlushMode icache_flush_mode = FLUSH_ICACHE_IF_NEEDED) {
     // The contextual mode must be preserved across IC patching.
     ASSERT(GetContextualMode(code->extra_ic_state()) ==
            GetContextualMode(target()->extra_ic_state()));
 
-    IC::set_target(code);
+    IC::set_target(code, icache_flush_mode);
   }
 
   virtual Handle<Code> slow_stub() const {
@@ -654,11 +658,12 @@ class StoreIC: public IC {
                                       InlineCacheHolderFlag cache_holder);
 
  private:
-  void set_target(Code* code) {
+  void set_target(Code* code,
+                  ICacheFlushMode icache_flush_mode = FLUSH_ICACHE_IF_NEEDED) {
     // Strict mode must be preserved across IC patching.
     ASSERT(GetStrictMode(code->extra_ic_state()) ==
            GetStrictMode(target()->extra_ic_state()));
-    IC::set_target(code);
+    IC::set_target(code, icache_flush_mode);
   }
 
   static void Clear(Isolate* isolate,