Merge RawICData::range_feedback_ field into RawICData::state_bits_.

runtime/vm/assembler_ia32.cc

Index: runtime/vm/assembler_ia32.cc
diff --git a/runtime/vm/assembler_ia32.cc b/runtime/vm/assembler_ia32.cc
index a36999c35aaeef4fda9c4df88bae37edfa75721a..adc95055165439b671def5c5cf45f1ece70ef5dc 100644
--- a/runtime/vm/assembler_ia32.cc
+++ b/runtime/vm/assembler_ia32.cc
@@ -2961,10 +2961,8 @@ void Assembler::UpdateRangeFeedback(Register value,
                                     Label* miss) {
   ASSERT(ICData::IsValidRangeFeedbackIndex(index));
   ComputeRange(scratch1, value, scratch2, scratch3, miss);
-  if (index != 0) {
-    shll(scratch1, Immediate(ICData::kBitsPerRangeFeedback * index));
-  }
-  orl(FieldAddress(ic_data, ICData::range_feedback_offset()), scratch1);
+  shll(scratch1, Immediate(ICData::RangeFeedbackShift(index)));
+  orl(FieldAddress(ic_data, ICData::state_bits_offset()), scratch1);
 }