Eagerly extract stack limit from Isolate in InitializeAstVisitor()

src/compiler/ast-graph-builder.h

Index: src/compiler/ast-graph-builder.h
diff --git a/src/compiler/ast-graph-builder.h b/src/compiler/ast-graph-builder.h
index a3be67f1b1d14c6360391d86b86c309db684dcf5..4099474096aa908637166b96747dacf9bfcf0fe6 100644
--- a/src/compiler/ast-graph-builder.h
+++ b/src/compiler/ast-graph-builder.h
@@ -129,6 +129,7 @@ class AstGraphBuilder : public AstVisitor {
   ContextScope* execution_context() const { return execution_context_; }
   CommonOperatorBuilder* common() const { return jsgraph_->common(); }
   CompilationInfo* info() const { return info_; }
+  Isolate* isolate() const;
   LanguageMode language_mode() const;
   JSGraph* jsgraph() { return jsgraph_; }
   Graph* graph() { return jsgraph_->graph(); }