Use a filter instead of a visitor to deoptimize selected functions in a context.

src/ia32/deoptimizer-ia32.cc

Index: src/ia32/deoptimizer-ia32.cc
diff --git a/src/ia32/deoptimizer-ia32.cc b/src/ia32/deoptimizer-ia32.cc
index c9ecaccd2daf318ffd3fbcaafca193a0e2965c6c..5795b18e3424c87e8eed3384fe00e79c915f305d 100644
--- a/src/ia32/deoptimizer-ia32.cc
+++ b/src/ia32/deoptimizer-ia32.cc
@@ -114,17 +114,19 @@ void Deoptimizer::EnsureRelocSpaceForLazyDeoptimization(Handle<Code> code) {
 }
 
 
-void Deoptimizer::DeoptimizeFunction(JSFunction* function) {
-  if (!function->IsOptimized()) return;
+void Deoptimizer::DeoptimizeFunctionWithPreparedFunctionList(
+    JSFunction* function) {
+  Isolate* isolate = function->GetIsolate();
+  HandleScope scope(isolate);
+  AssertNoAllocation no_allocation;
+
+  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();
 
-  Isolate* isolate = function->GetIsolate();
-  HandleScope scope(isolate);
-  AssertNoAllocation no_allocation;
-
   // Get the optimized code.
   Code* code = function->code();
   Address code_start_address = code->instruction_start();