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

src/compiler/ast-loop-assignment-analyzer.cc

Index: src/compiler/ast-loop-assignment-analyzer.cc
diff --git a/src/compiler/ast-loop-assignment-analyzer.cc b/src/compiler/ast-loop-assignment-analyzer.cc
index d90ea71bf18069c4f6267cd5d6b130ec306a85c1..1ff05608230d37a7cf90e5b24aec19fc8f3c3ea7 100644
--- a/src/compiler/ast-loop-assignment-analyzer.cc
+++ b/src/compiler/ast-loop-assignment-analyzer.cc
@@ -14,7 +14,7 @@ typedef class AstLoopAssignmentAnalyzer ALAA;  // for code shortitude.
 
 ALAA::AstLoopAssignmentAnalyzer(Zone* zone, CompilationInfo* info)
     : info_(info), zone_(zone), loop_stack_(zone) {
-  InitializeAstVisitor(info->isolate());
+  InitializeAstVisitor(info->isolate()->stack_guard()->real_climit());
 }