[turbofan] Remove the JSContextRelaxation reducer.

src/compiler/pipeline.cc

Index: src/compiler/pipeline.cc
diff --git a/src/compiler/pipeline.cc b/src/compiler/pipeline.cc
index 2e9332536245c56e333e75af3dd3a414dddc0b9d..61cecab53cd6cdf583d291d1aabcb4304d2b6773 100644
--- a/src/compiler/pipeline.cc
+++ b/src/compiler/pipeline.cc
@@ -30,7 +30,6 @@
 #include "src/compiler/instruction-selector.h"
 #include "src/compiler/js-builtin-reducer.h"
 #include "src/compiler/js-call-reducer.h"
-#include "src/compiler/js-context-relaxation.h"
 #include "src/compiler/js-context-specialization.h"
 #include "src/compiler/js-create-lowering.h"
 #include "src/compiler/js-frame-specialization.h"
@@ -788,7 +787,6 @@ struct GenericLoweringPhase {
 
   void Run(PipelineData* data, Zone* temp_zone) {
     JSGraphReducer graph_reducer(data->jsgraph(), temp_zone);
-    JSContextRelaxation context_relaxing;
     DeadCodeElimination dead_code_elimination(&graph_reducer, data->graph(),
                                               data->common());
     CommonOperatorReducer common_reducer(&graph_reducer, data->graph(),
@@ -798,7 +796,6 @@ struct GenericLoweringPhase {
     SelectLowering select_lowering(data->jsgraph()->graph(),
                                    data->jsgraph()->common());
     TailCallOptimization tco(data->common(), data->graph());
-    AddReducer(data, &graph_reducer, &context_relaxing);
     AddReducer(data, &graph_reducer, &dead_code_elimination);
     AddReducer(data, &graph_reducer, &common_reducer);
     AddReducer(data, &graph_reducer, &generic_lowering);