Add a is_recognized bit to function kind field. Improves performance of method recognizer and thus …

runtime/vm/object.h

Index: runtime/vm/object.h
===================================================================
--- runtime/vm/object.h	(revision 28022)
+++ runtime/vm/object.h	(working copy)
@@ -1680,6 +1680,11 @@
   }
   void set_is_intrinsic(bool value) const;
 
+  bool is_recognized() const {
+    return RecognizedBit::decode(raw_ptr()->kind_tag_);
+  }
+  void set_is_recognized(bool value) const;
+
   bool HasOptimizedCode() const;
 
   // Returns true if the argument counts are valid for calling this function.
@@ -1838,7 +1843,8 @@
     kExternalBit = 7,
     kVisibleBit = 8,
     kIntrinsicBit = 9,
-    kKindTagBit = 10,
+    kRecognizedBit = 10,
+    kKindTagBit = 11,
     kKindTagSize = 4,
   };
   class StaticBit : public BitField<bool, kStaticBit, 1> {};
@@ -1851,6 +1857,7 @@
   class ExternalBit : public BitField<bool, kExternalBit, 1> {};
   class VisibleBit : public BitField<bool, kVisibleBit, 1> {};
   class IntrinsicBit : public BitField<bool, kIntrinsicBit, 1> {};
+  class RecognizedBit : public BitField<bool, kRecognizedBit, 1> {};
   class KindBits :
     public BitField<RawFunction::Kind, kKindTagBit, kKindTagSize> {};  // NOLINT
 
@@ -2499,6 +2506,11 @@
 
   static bool IsPrivate(const String& name);
 
+  // Return Function::null() if function does not exist in libs.
+  static RawFunction* GetFunction(const GrowableArray<Library*>& libs,
+                                  const char* class_name,
+                                  const char* function_name);
+
  private:
   static const int kInitialImportsCapacity = 4;
   static const int kImportsCapacityIncrement = 8;