Simplify stack check instruction in Crankshaft.

src/hydrogen.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2315 matching lines @@
 
     // Handle implicit declaration of the function name in named function
     // expressions before other declarations.
     if (scope->is_function_scope() && scope->function() != NULL) {
       HandleDeclaration(scope->function(), CONST, NULL);
     }
     VisitDeclarations(scope->declarations());
     AddSimulate(AstNode::kDeclarationsId);
 
     HValue* context = environment()->LookupContext();
-    AddInstruction(
-        new(zone()) HStackCheck(context, HStackCheck::kFunctionEntry));
+    AddInstruction(new(zone()) HStackCheck(context));
 
     VisitStatements(info()->function()->body());
     if (HasStackOverflow()) return NULL;
 
     if (current_block() != NULL) {
       HReturn* instr = new(zone()) HReturn(graph()->GetConstantUndefined());
       current_block()->FinishExit(instr);
       set_current_block(NULL);
     }
   }
@@ skipping 567 matching lines @@
   set_current_block(loop_predecessor);
 }
 
 
 void HGraphBuilder::VisitLoopBody(IterationStatement* stmt,
                                   HBasicBlock* loop_entry,
                                   BreakAndContinueInfo* break_info) {
   BreakAndContinueScope push(break_info, this);
   AddSimulate(stmt->StackCheckId());
   HValue* context = environment()->LookupContext();
-  HStackCheck* stack_check =
-    new(zone()) HStackCheck(context, HStackCheck::kBackwardsBranch);
+  HStackCheck* stack_check = new(zone()) HStackCheck(context);
   AddInstruction(stack_check);
   ASSERT(loop_entry->IsLoopHeader());
   loop_entry->loop_information()->set_stack_check(stack_check);
   CHECK_BAILOUT(Visit(stmt->body()));
 }
 
 
 void HGraphBuilder::VisitDoWhileStatement(DoWhileStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
@@ skipping 4287 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify(false);  // No full verify.
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal