Use same range info when emitting code and computing if instruction can deopt.

runtime/vm/intermediate_language_dbc.cc

Index: runtime/vm/intermediate_language_dbc.cc
diff --git a/runtime/vm/intermediate_language_dbc.cc b/runtime/vm/intermediate_language_dbc.cc
index 04dd1905c3b3188124993a2d46e095e4e6bc12fe..b8c5c3c18fa24fb746157c3f9501f27ffad1748f 100644
--- a/runtime/vm/intermediate_language_dbc.cc
+++ b/runtime/vm/intermediate_language_dbc.cc
@@ -35,7 +35,7 @@ DECLARE_FLAG(int, optimization_counter_threshold);
   M(Int32ToDouble)                                                             \
   M(DoubleToInteger)                                                           \
   M(BoxInt64)                                                                  \
-  M(MergedMath)                                                                \
+  M(TruncDivMod)                                                               \
   M(GuardFieldClass)                                                           \
   M(GuardFieldLength)                                                          \
   M(IfThenElse)                                                                \
@@ -1331,15 +1331,6 @@ CompileType UnaryUint32OpInstr::ComputeType() const {
 }
 
 
-static const intptr_t kMintShiftCountLimit = 63;
-
-
-bool ShiftMintOpInstr::has_shift_count_check() const {
-  return !RangeUtils::IsWithin(right()->definition()->range(), 0,
-                               kMintShiftCountLimit);
-}
-
-
 CompileType LoadIndexedInstr::ComputeType() const {
   switch (class_id_) {
     case kArrayCid: