Consolidate a few fields in RawFunction using bitfields.

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
===================================================================
--- runtime/vm/dart_api_impl.cc	(revision 9727)
+++ runtime/vm/dart_api_impl.cc	(working copy)
@@ -2734,8 +2734,7 @@
     ASSERT(func_kind == RawFunction::kFunction ||
            func_kind == RawFunction::kGetterFunction ||
            func_kind == RawFunction::kSetterFunction ||
-           func_kind == RawFunction::kConstructor ||
-           func_kind == RawFunction::kAbstract);
+           func_kind == RawFunction::kConstructor);
   }
 #endif
   return Api::NewHandle(isolate, func.raw());
@@ -2776,7 +2775,7 @@
   if (func.IsNull()) {
     RETURN_TYPE_ERROR(isolate, function, Function);
   }
-  *is_abstract = (func.kind() == RawFunction::kAbstract);
+  *is_abstract = func.is_abstract();
   return Api::Success(isolate);
 }
 
@@ -2824,13 +2823,7 @@
   if (func.IsNull()) {
     RETURN_TYPE_ERROR(isolate, function, Function);
   }
-  // TODO(turnidge): It would be nice if I could just use func.kind()
-  // to check for a getter function here, but unfortunately the only
-  // way to distinguish abstract getter functions is to use the name
-  // itself.  Consider adding a RawFunction::kAbstractGetter type.
-  const String& func_name = String::Handle(isolate, func.name());
-  *is_getter = Field::IsGetterName(func_name);
-
+  *is_getter = (func.kind() == RawFunction::kGetterFunction);
   return Api::Success(isolate);
 }
 
@@ -2846,13 +2839,7 @@
   if (func.IsNull()) {
     RETURN_TYPE_ERROR(isolate, function, Function);
   }
-  // TODO(turnidge): It would be nice if I could just use func.kind()
-  // to check for a setter function here, but unfortunately the only
-  // way to distinguish abstract setter functions is to use the name
-  // itself.  Consider adding a RawFunction::kAbstractSetter type.
-  const String& func_name = String::Handle(isolate, func.name());
-  *is_setter = Field::IsSetterName(func_name);
-
+  *is_setter = (func.kind() == RawFunction::kSetterFunction);
   return Api::Success(isolate);
 }