Don't force range of the RangeBoundary::Shl into the Smi.

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
diff --git a/runtime/vm/intermediate_language.cc b/runtime/vm/intermediate_language.cc
index e23603fb493170adaf9683639b5a2d613187e894..34a83cfd186382175f82cfa703976aaf85df1d75 100644
--- a/runtime/vm/intermediate_language.cc
+++ b/runtime/vm/intermediate_language.cc
@@ -2732,7 +2732,7 @@ RangeBoundary RangeBoundary::Shl(const RangeBoundary& value_boundary,
       ((limit > 0) && (Utils::IsInt(limit, value)))) {
     // Result stays in 64 bit range.
     int64_t result = value << shift_count;
-    return Smi::IsValid(result) ? RangeBoundary(result) : overflow;
+    return RangeBoundary(result);
   }
 
   return overflow;