Revert change 6302 until the compiler warning is addressed.

vm/bitmap.cc

Index: vm/bitmap.cc
===================================================================
--- vm/bitmap.cc	(revision 6302)
+++ vm/bitmap.cc	(working copy)
@@ -63,8 +63,8 @@
 
 
 void BitmapBuilder::SetBits(const Stackmap& bitmap) {
-  intptr_t min = bitmap.MinimumBitOffset();
-  intptr_t max = bitmap.MaximumBitOffset();
+  intptr_t min = bitmap.Minimum();
+  intptr_t max = bitmap.Maximum();
   if (min == Stackmap::kNoMinimum || max == Stackmap::kNoMaximum) {
     return;
   }