[turbofan] Remove the JSContextRelaxation reducer.

test/unittests/compiler/instruction-selector-unittest.cc

Index: test/unittests/compiler/instruction-selector-unittest.cc
diff --git a/test/unittests/compiler/instruction-selector-unittest.cc b/test/unittests/compiler/instruction-selector-unittest.cc
index 25b61212dff0274fced93a883f31c60841b73ba2..16030f80d7867146fb2c90505155347add621861 100644
--- a/test/unittests/compiler/instruction-selector-unittest.cc
+++ b/test/unittests/compiler/instruction-selector-unittest.cc
@@ -148,7 +148,7 @@ InstructionSelectorTest::StreamBuilder::GetFrameStateFunctionInfo(
     int parameter_count, int local_count) {
   return common()->CreateFrameStateFunctionInfo(
       FrameStateType::kJavaScriptFunction, parameter_count, local_count,
-      Handle<SharedFunctionInfo>(), CALL_MAINTAINS_NATIVE_CONTEXT);
+      Handle<SharedFunctionInfo>());
 }