Consolidate a few fields in RawFunction using bitfields.

runtime/vm/compiler.cc

Index: runtime/vm/compiler.cc
===================================================================
--- runtime/vm/compiler.cc	(revision 9727)
+++ runtime/vm/compiler.cc	(working copy)
@@ -408,7 +408,7 @@
   for (int i = 0; i < functions.Length(); i++) {
     func ^= functions.At(i);
     ASSERT(!func.IsNull());
-    if (!func.HasCode() && !func.IsAbstract()) {
+    if (!func.HasCode() && !func.is_abstract()) {
       error = CompileFunction(func);
       if (!error.IsNull()) {
         return error.raw();
@@ -437,6 +437,7 @@
         RawFunction::kConstImplicitGetter,
         true,  // static function.
         false,  // not const function.
+        false,  // not abstract
         fragment->token_pos()));
 
     func.set_result_type(Type::Handle(Type::DynamicType()));