[turbofan]: Add a context relaxer reducer

test/unittests/compiler/instruction-selector-unittest.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 "test/unittests/compiler/instruction-selector-unittest.h"
 
 #include "src/compiler/graph.h"
 #include "src/compiler/schedule.h"
 #include "src/flags.h"
 #include "test/unittests/compiler/compiler-test-utils.h"
@@ skipping 135 matching lines @@
   const UnallocatedOperand* unallocated = UnallocatedOperand::cast(operand);
   return unallocated->IsUsedAtStart();
 }
 
 
 const FrameStateFunctionInfo*
 InstructionSelectorTest::StreamBuilder::GetFrameStateFunctionInfo(
     int parameter_count, int local_count) {
   return common()->CreateFrameStateFunctionInfo(
       FrameStateType::kJavaScriptFunction, parameter_count, local_count,
-      Handle<SharedFunctionInfo>());
+      Handle<SharedFunctionInfo>(), CALL_MAINTAINS_NATIVE_CONTEXT);
 }
 
 
 // -----------------------------------------------------------------------------
 // Return.
 
 
 TARGET_TEST_F(InstructionSelectorTest, ReturnFloat32Constant) {
   const float kValue = 4.2f;
   StreamBuilder m(this, kMachFloat32);
@@ skipping 439 matching lines @@
   EXPECT_EQ(s.ToVreg(context2), s.ToVreg(call_instr->InputAt(14)));
   // Continuation.
 
   EXPECT_EQ(kArchRet, s[index++]->arch_opcode());
   EXPECT_EQ(index, s.size());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8