include only stuff you need, part 1: ast.h, ast-value-factory.h.

src/crankshaft/typing.h

Index: src/crankshaft/typing.h
diff --git a/src/crankshaft/typing.h b/src/crankshaft/typing.h
index 1e301ccbbb7f62ea2ec5cbde43cb8b063f77f2be..94340c5a74510736f691b8a5be2c02828cc5a42e 100644
--- a/src/crankshaft/typing.h
+++ b/src/crankshaft/typing.h
@@ -7,8 +7,8 @@
 
 #include "src/allocation.h"
 #include "src/ast/ast-type-bounds.h"
-#include "src/ast/ast.h"
 #include "src/ast/scopes.h"
+#include "src/ast/variables.h"
 #include "src/effects.h"
 #include "src/type-info.h"
 #include "src/types.h"
@@ -17,6 +17,8 @@
 namespace v8 {
 namespace internal {
 
+class FunctionLiteral;
+
 class AstTyper final : public AstVisitor<AstTyper> {
  public:
   AstTyper(Isolate* isolate, Zone* zone, Handle<JSFunction> closure,