Handlify the stub cache lookup and patching for CallIC and KeyedCallIC.

src/debug.cc

Index: src/debug.cc
diff --git a/src/debug.cc b/src/debug.cc
index 492b617526107bb1e0b4b75669df43d79788fa18..dc9f2974f7286d64fc603890a669ebe5a2ce33f5 100644
--- a/src/debug.cc
+++ b/src/debug.cc
@@ -87,19 +87,13 @@ static void PrintLn(v8::Local<v8::Value> value) {
 
 static Handle<Code> ComputeCallDebugBreak(int argc, Code::Kind kind) {
   Isolate* isolate = Isolate::Current();
-  CALL_HEAP_FUNCTION(
-      isolate,
-      isolate->stub_cache()->ComputeCallDebugBreak(argc, kind),
-      Code);
+  return isolate->stub_cache()->ComputeCallDebugBreak(argc, kind);
 }
 
 
 static Handle<Code> ComputeCallDebugPrepareStepIn(int argc, Code::Kind kind) {
   Isolate* isolate = Isolate::Current();
-  CALL_HEAP_FUNCTION(
-      isolate,
-      isolate->stub_cache()->ComputeCallDebugPrepareStepIn(argc, kind),
-      Code);
+  return isolate->stub_cache()->ComputeCallDebugPrepareStepIn(argc, kind);
 }