Allow map check hoisting in GVN for stable maps.

test/cctest/test-deoptimization.cc

 // Copyright 2012 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 520 matching lines @@
 
   CHECK(!GetJSFunction(env->Global(), "f")->IsOptimized());
   CHECK_EQ(1, env->Global()->Get(v8_str("count"))->Int32Value());
   CHECK_EQ(true, env->Global()->Get(v8_str("result"))->BooleanValue());
   CHECK_EQ(0, Deoptimizer::GetDeoptimizedCodeCount(CcTest::i_isolate()));
 }
 
 
 TEST(DeoptimizeLoadICStoreIC) {
   i::FLAG_concurrent_recompilation = false;
-  i::FLAG_check_elimination = false;
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
 
   // Functions to generate load/store/keyed load/keyed store IC calls.
   const char* f1_source = "function f1(x) { return x.y; };";
   const char* g1_source = "function g1(x) { x.y = 1; };";
   const char* f2_source = "function f2(x, y) { return x[y]; };";
   const char* g2_source = "function g2(x, y) { x[y] = 1; };";
 
   {
@@ skipping 55 matching lines @@
                "g2(new X(), 'z');");
   }
   NonIncrementalGC();
 
   CHECK(!GetJSFunction(env->Global(), "f1")->IsOptimized());
   CHECK(!GetJSFunction(env->Global(), "g1")->IsOptimized());
   CHECK(!GetJSFunction(env->Global(), "f2")->IsOptimized());
   CHECK(!GetJSFunction(env->Global(), "g2")->IsOptimized());
   CHECK_EQ(4, env->Global()->Get(v8_str("count"))->Int32Value());
   CHECK_EQ(13, env->Global()->Get(v8_str("result"))->Int32Value());
-  CHECK_EQ(0, Deoptimizer::GetDeoptimizedCodeCount(CcTest::i_isolate()));
 }
 
 
 TEST(DeoptimizeLoadICStoreICNested) {
   i::FLAG_concurrent_recompilation = false;
-  i::FLAG_check_elimination = false;
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
 
   // Functions to generate load/store/keyed load/keyed store IC calls.
   const char* f1_source = "function f1(x) { return x.y; };";
   const char* g1_source = "function g1(x) { x.y = 1; };";
   const char* f2_source = "function f2(x, y) { return x[y]; };";
   const char* g2_source = "function g2(x, y) { x[y] = 1; };";
 
   {
@@ skipping 56 matching lines @@
                "var result = f1(new X());");
   }
   NonIncrementalGC();
 
   CHECK(!GetJSFunction(env->Global(), "f1")->IsOptimized());
   CHECK(!GetJSFunction(env->Global(), "g1")->IsOptimized());
   CHECK(!GetJSFunction(env->Global(), "f2")->IsOptimized());
   CHECK(!GetJSFunction(env->Global(), "g2")->IsOptimized());
   CHECK_EQ(1, env->Global()->Get(v8_str("count"))->Int32Value());
   CHECK_EQ(13, env->Global()->Get(v8_str("result"))->Int32Value());
-  CHECK_EQ(0, Deoptimizer::GetDeoptimizedCodeCount(CcTest::i_isolate()));
 }