includes: Make ast.h not need isolate.h any more.

src/crankshaft/typing.cc

Index: src/crankshaft/typing.cc
diff --git a/src/crankshaft/typing.cc b/src/crankshaft/typing.cc
index 3b95841afde255b3b425c104a1ee5931e670e44a..a42eb4d2bb8d3f9d70b8906d587f7b18528a340d 100644
--- a/src/crankshaft/typing.cc
+++ b/src/crankshaft/typing.cc
@@ -6,8 +6,10 @@
 
 #include "src/ast/compile-time-value.h"
 #include "src/ast/scopes.h"
+#include "src/execution.h"
 #include "src/frames-inl.h"
 #include "src/frames.h"
+#include "src/isolate.h"
 #include "src/ostreams.h"
 #include "src/splay-tree-inl.h"
 
@@ -28,7 +30,7 @@ AstTyper::AstTyper(Isolate* isolate, Zone* zone, Handle<JSFunction> closure,
               handle(closure->context()->native_context())),
       store_(zone),
       bounds_(bounds) {
-  InitializeAstVisitor(isolate);
+  InitializeAstVisitor(isolate->stack_guard()->real_climit());
 }