[turbofan] Deferred blocks splintering.

src/compiler/ast-graph-builder.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/ast-graph-builder.h"
 
 #include "src/compiler.h"
 #include "src/compiler/ast-loop-assignment-analyzer.h"
 #include "src/compiler/control-builders.h"
 #include "src/compiler/js-type-feedback.h"
@@ skipping 2910 matching lines @@
 void AstGraphBuilder::VisitInScope(Statement* stmt, Scope* s, Node* context) {
   ContextScope scope(this, s, context);
   DCHECK(s->declarations()->is_empty());
   Visit(stmt);
 }
 
 
 void AstGraphBuilder::VisitIterationBody(IterationStatement* stmt,
                                          LoopBuilder* loop) {
   ControlScopeForIteration scope(this, stmt, loop);
-  // TODO(mstarzinger): For now we only allow to interrupt non-asm.js code,
-  // which is a gigantic hack and should be extended to all code at some point.
-  if (!info()->shared_info()->asm_function()) {
+  if (FLAG_turbo_loop_stackcheck) {
     Node* node = NewNode(javascript()->StackCheck());
     PrepareFrameState(node, stmt->StackCheckId());
   }
   Visit(stmt->body());
 }
 
 
 void AstGraphBuilder::VisitDelete(UnaryOperation* expr) {
   Node* value;
   if (expr->expression()->IsVariableProxy()) {
@@ skipping 1358 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8