Only flush SharedFunctionInfo optimized code cache when necessary

src/x64/deoptimizer-x64.cc

Index: src/x64/deoptimizer-x64.cc
diff --git a/src/x64/deoptimizer-x64.cc b/src/x64/deoptimizer-x64.cc
index 36280ec8b4d516758f44a7a96e16af00fe6ecf14..927496c458a09d7be1e9ffa5afc18d649ccfbce8 100644
--- a/src/x64/deoptimizer-x64.cc
+++ b/src/x64/deoptimizer-x64.cc
@@ -55,13 +55,12 @@ void Deoptimizer::DeoptimizeFunctionWithPreparedFunctionList(
   ASSERT(function->IsOptimized());
   ASSERT(function->FunctionsInFunctionListShareSameCode());
 
-  // The optimized code is going to be patched, so we cannot use it
-  // any more.  Play safe and reset the whole cache.
-  function->shared()->ClearOptimizedCodeMap("deoptimized function");
-
   // Get the optimized code.
   Code* code = function->code();
 
+  // The optimized code is going to be patched, so we cannot use it any more.
+  function->shared()->EvictFromOptimizedCodeMap(code, "deoptimized function");
+
   // Invalidate the relocation information, as it will become invalid by the
   // code patching below, and is not needed any more.
   code->InvalidateRelocation();