Reland of "Steps towards unification of number bitset and range types."

src/compiler/change-lowering.cc

Index: src/compiler/change-lowering.cc
diff --git a/src/compiler/change-lowering.cc b/src/compiler/change-lowering.cc
index 2b369d97cb0f040142b74cfeebada497636473bd..93faf0f4283545791d6f3d64cd58ccde4781f34f 100644
--- a/src/compiler/change-lowering.cc
+++ b/src/compiler/change-lowering.cc
@@ -163,7 +163,7 @@ Reduction ChangeLowering::ChangeInt32ToTagged(Node* value, Node* control) {
         machine()->Word64Shl(),
         graph()->NewNode(machine()->ChangeInt32ToInt64(), value),
         SmiShiftBitsConstant()));
-  } else if (NodeProperties::GetBounds(value).upper->Is(Type::SignedSmall())) {
+  } else if (NodeProperties::GetBounds(value).upper->Is(Type::Signed31())) {
     return Replace(
         graph()->NewNode(machine()->WordShl(), value, SmiShiftBitsConstant()));
   }