[turbofan] Remove obsolete JSTypeFeedbackSpecializer and JSTypeFeedbackLowering.

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index 25e791caa234e10f5879028e87e6d475b242ab7e..46f83e2310c30011a5ccb4d94084fb022fba01c0 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -122,7 +122,6 @@ class CompilationInfo {
     kTypingEnabled = 1 << 12,
     kDisableFutureOptimization = 1 << 13,
     kSplittingEnabled = 1 << 14,
-    kTypeFeedbackEnabled = 1 << 15,
     kDeoptimizationEnabled = 1 << 16,
     kSourcePositionsEnabled = 1 << 17,
     kFirstCompile = 1 << 18,
@@ -239,12 +238,6 @@ class CompilationInfo {
     return GetFlag(kNativeContextSpecializing);
   }
 
-  void MarkAsTypeFeedbackEnabled() { SetFlag(kTypeFeedbackEnabled); }
-
-  bool is_type_feedback_enabled() const {
-    return GetFlag(kTypeFeedbackEnabled);
-  }
-
   void MarkAsDeoptimizationEnabled() { SetFlag(kDeoptimizationEnabled); }
 
   bool is_deoptimization_enabled() const {