Omit stack check in non-looping loops.

src/hydrogen.cc

 // Copyright 2013 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 "hydrogen.h"
 
 #include <algorithm>
 
 #include "v8.h"
 #include "allocation-site-scopes.h"
@@ skipping 4594 matching lines @@
 
   BreakAndContinueInfo break_info(stmt);
   CHECK_BAILOUT(VisitLoopBody(stmt, loop_entry, &break_info));
   HBasicBlock* body_exit =
       JoinContinue(stmt, current_block(), break_info.continue_block());
   HBasicBlock* loop_successor = NULL;
   if (body_exit != NULL && !stmt->cond()->ToBooleanIsTrue()) {
     set_current_block(body_exit);
     loop_successor = graph()->CreateBasicBlock();
     if (stmt->cond()->ToBooleanIsFalse()) {
+      loop_entry->loop_information()->stack_check()->Eliminate();
       Goto(loop_successor);
       body_exit = NULL;
     } else {
       // The block for a true condition, the actual predecessor block of the
       // back edge.
       body_exit = graph()->CreateBasicBlock();
       CHECK_BAILOUT(VisitForControl(stmt->cond(), body_exit, loop_successor));
     }
     if (body_exit != NULL && body_exit->HasPredecessor()) {
       body_exit->SetJoinId(stmt->BackEdgeId());
@@ skipping 7176 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal