Clear optimized code map during incremental marking.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index b25af33c77a59d14f2d92a40b422297242c9cc90..2d265ec214ad2553e49bb4a8d2317cfa65d98474 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -4279,11 +4279,10 @@ BOOL_ACCESSORS(SharedFunctionInfo, compiler_hints, dont_cache, kDontCache)
 
 void SharedFunctionInfo::BeforeVisitingPointers() {
   if (IsInobjectSlackTrackingInProgress()) DetachInitialMap();
+}
+
 
-  // Flush optimized code map on major GC.
-  // Note: we may experiment with rebuilding it or retaining entries
-  // which should survive as we iterate through optimized functions
-  // anyway.
+void SharedFunctionInfo::ClearOptimizedCodeMap() {
   set_optimized_code_map(Smi::FromInt(0));
 }