Remove some unused fields from class CompilationInfo.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 1033075edb6d10d37de4da77570b88b175c14a82..89a25b524ee920e46b74264024da8cb9842a8945 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -6374,7 +6374,7 @@ static Object* Runtime_LazyCompile(Arguments args) {
   // this means that things called through constructors are never known to
   // be in loops.  We compile them as if they are in loops here just in case.
   ASSERT(!function->is_compiled());
-  if (!CompileLazyInLoop(function, Handle<Object>::null(), KEEP_EXCEPTION)) {
+  if (!CompileLazyInLoop(function, KEEP_EXCEPTION)) {
     return Failure::Exception();
   }