[turbofan] Initial version of number type feedback.

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index 64bc88d4981d510be7d5039ede91714c6c58e96f..e0ebd453781f4a7102c007aec79edde0ac7efa6b 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -146,6 +146,7 @@ class CompilationInfo final {
     kSourcePositionsEnabled = 1 << 15,
     kBailoutOnUninitialized = 1 << 16,
     kOptimizeFromBytecode = 1 << 17,
+    kTypeFeedbackEnabled = 1 << 18,
   };
 
   CompilationInfo(ParseInfo* parse_info, Handle<JSFunction> closure);
@@ -256,6 +257,12 @@ class CompilationInfo final {
     return GetFlag(kDeoptimizationEnabled);
   }
 
+  void MarkAsTypeFeedbackEnabled() { SetFlag(kTypeFeedbackEnabled); }
+
+  bool is_type_feedback_enabled() const {
+    return GetFlag(kTypeFeedbackEnabled);
+  }
+
   void MarkAsSourcePositionsEnabled() { SetFlag(kSourcePositionsEnabled); }
 
   bool is_source_positions_enabled() const {