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

src/ast/ast.h

Index: src/ast/ast.h
diff --git a/src/ast/ast.h b/src/ast/ast.h
index 596149db53d6a1164d74e87b7a42389d606c88e8..cc6a64390c9dd12c70a6bab1a4e7e70b0b242e77 100644
--- a/src/ast/ast.h
+++ b/src/ast/ast.h
@@ -11,7 +11,9 @@
 #include "src/ast/variables.h"
 #include "src/bailout-reason.h"
 #include "src/base/flags.h"
+#include "src/factory.h"
 #include "src/globals.h"
+#include "src/isolate.h"
 #include "src/list.h"
 #include "src/parsing/token.h"
 #include "src/runtime/runtime.h"
@@ -115,7 +117,6 @@
 class BreakableStatement;
 class Expression;
 class IterationStatement;
-class Isolate;
 class MaterializedLiteral;
 class Statement;
 class TypeFeedbackOracle;
@@ -2903,6 +2904,11 @@
   }                                                         \
                                                             \
  private:                                                   \
+  void InitializeAstVisitor(Isolate* isolate) {             \
+    stack_limit_ = isolate->stack_guard()->real_climit();   \
+    stack_overflow_ = false;                                \
+  }                                                         \
+                                                            \
   void InitializeAstVisitor(uintptr_t stack_limit) {        \
     stack_limit_ = stack_limit;                             \
     stack_overflow_ = false;                                \
@@ -2931,6 +2937,11 @@
   }                                                   \
                                                       \
  private:                                             \
+  void InitializeAstRewriter(Isolate* isolate) {      \
+    InitializeAstVisitor(isolate);                    \
+    replacement_ = nullptr;                           \
+  }                                                   \
+                                                      \
   void InitializeAstRewriter(uintptr_t stack_limit) { \
     InitializeAstVisitor(stack_limit);                \
     replacement_ = nullptr;                           \