[turbofan] Introduce JSStackCheck operator.

src/compiler/ast-graph-builder.cc

Index: src/compiler/ast-graph-builder.cc
diff --git a/src/compiler/ast-graph-builder.cc b/src/compiler/ast-graph-builder.cc
index e87ca786b19775e1dac0d88e370b1ac7d75bb6f1..ef401cf4bd8bf9707664a616f870ba736dd8db81 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -2966,17 +2966,7 @@ Node* AstGraphBuilder::BuildBinaryOp(Node* left, Node* right, Token::Value op) {
 
 
 Node* AstGraphBuilder::BuildStackCheck() {
-  IfBuilder stack_check(this);
-  Node* limit = BuildLoadExternal(
-      ExternalReference::address_of_stack_limit(isolate()), kMachPtr);
-  Node* stack = NewNode(jsgraph()->machine()->LoadStackPointer());
-  Node* tag = NewNode(jsgraph()->machine()->UintLessThan(), limit, stack);
-  stack_check.If(tag, BranchHint::kTrue);
-  stack_check.Then();
-  stack_check.Else();
-  Node* guard = NewNode(javascript()->CallRuntime(Runtime::kStackGuard, 0));
-  stack_check.End();
-  return guard;
+  return NewNode(javascript()->StackCheck());

[Michael Starzinger, 2015/03/06 14:06:39]

nit: I think we can now inline this into CreateGraphBody. WDYT?

[Benedikt Meurer, 2015/03/09 05:01:45]

Indeed.

 }