- Remove kFreeBit, as it is not needed any longer

runtime/vm/raw_object.h

Index: runtime/vm/raw_object.h
===================================================================
--- runtime/vm/raw_object.h	(revision 22179)
+++ runtime/vm/raw_object.h	(working copy)
@@ -219,13 +219,12 @@
   // The tags field which is a part of the object header uses the following
   // bit fields for storing tags.
   enum TagBits {
-    kFreeBit = 0,
+    kWatchedBit = 0,
     kMarkBit = 1,
     kCanonicalBit = 2,
     kFromSnapshotBit = 3,
-    kWatchedBit = 4,
-    kReservedTagBit = 5,  // kReservedBit{10K,100K,1M,10M}
-    kReservedTagSize = 3,
+    kReservedTagBit = 4,  // kReservedBit{1K, 10K,100K,1M,10M}
+    kReservedTagSize = 4,
     kSizeTagBit = 8,
     kSizeTagSize = 8,
     kClassIdTagBit = kSizeTagBit + kSizeTagSize,
@@ -386,12 +385,10 @@
  private:
   uword tags_;  // Various object tags (bits).
 
-  class FreeBit : public BitField<bool, kFreeBit, 1> {};
+  class WatchedBit : public BitField<bool, kWatchedBit, 1> {};
 
   class MarkBit : public BitField<bool, kMarkBit, 1> {};
 
-  class WatchedBit : public BitField<bool, kWatchedBit, 1> {};
-
   class CanonicalObjectTag : public BitField<bool, kCanonicalBit, 1> {};
 
   class CreatedFromSnapshotTag : public BitField<bool, kFromSnapshotBit, 1> {};