Remove some unused fields from class CompilationInfo.

src/ic.cc

Index: src/ic.cc
diff --git a/src/ic.cc b/src/ic.cc
index 5b62a8a09c80321721c91b002c257348cc8af88e..a9c2a4837cf1258448e1d47811d49bf4092854ff 100644
--- a/src/ic.cc
+++ b/src/ic.cc
@@ -1541,18 +1541,17 @@ void KeyedStoreIC::UpdateCaches(LookupResult* lookup,
 // Static IC stub generators.
 //
 
-static Object* CompileFunction(Object* result,
-                               Handle<Object> object,
-                               InLoopFlag in_loop) {
+static JSFunction* CompileFunction(JSFunction* function,
+                                   InLoopFlag in_loop) {
   // Compile now with optimization.
   HandleScope scope;
-  Handle<JSFunction> function = Handle<JSFunction>(JSFunction::cast(result));
+  Handle<JSFunction> function_handle(function);
   if (in_loop == IN_LOOP) {
-    CompileLazyInLoop(function, object, CLEAR_EXCEPTION);
+    CompileLazyInLoop(function_handle, CLEAR_EXCEPTION);
   } else {
-    CompileLazy(function, object, CLEAR_EXCEPTION);
+    CompileLazy(function_handle, CLEAR_EXCEPTION);
   }
-  return *function;
+  return *function_handle;
 }
 
 
@@ -1575,7 +1574,7 @@ Object* CallIC_Miss(Arguments args) {
   if (!result->IsJSFunction() || JSFunction::cast(result)->is_compiled()) {
     return result;
   }
-  return CompileFunction(result, args.at<Object>(0), ic.target()->ic_in_loop());
+  return CompileFunction(JSFunction::cast(result), ic.target()->ic_in_loop());
 }
 
 
@@ -1591,7 +1590,7 @@ Object* KeyedCallIC_Miss(Arguments args) {
   if (!result->IsJSFunction() || JSFunction::cast(result)->is_compiled()) {
     return result;
   }
-  return CompileFunction(result, args.at<Object>(0), ic.target()->ic_in_loop());
+  return CompileFunction(JSFunction::cast(result), ic.target()->ic_in_loop());
 }