Back out "Revert D93657219: [Cinderx][ARM64] Need to set output type even if input isn't small"

Summary:
Reverting the revert - this is an ARM specific commit which wouldn't cause IG issues.

If we have a small output type the input can end up being big (e.g. a 64-bit "1"). So this needs to apply even in that case.

Original commit changeset: 0601642fbbd3

Original Phabricator Diff: D93657219

Reviewed By: yoney

Differential Revision: D93753151

fbshipit-source-id: 752c41d0d8cc4208514d188c5b294e6dd14518ca

Author: DinoV

cinderx/Jit/lir/postalloc.cpp

@@ -706,13 +706,11 @@ RewriteResult rewriteSubWordRegMoves(instr_iter_t instr_iter) {
     return kUnchanged;
   }
 
-  size = in->dataType();
-  if (size != OperandBase::k8bit && size != OperandBase::k16bit) {
-    return kUnchanged;
-  }
-
   out->setDataType(OperandBase::k32bit);
-  static_cast<Operand*>(in)->setDataType(OperandBase::k32bit);
+  if (in->dataType() == OperandBase::k8bit ||
+      in->dataType() == OperandBase::k16bit) {
+    static_cast<Operand*>(in)->setDataType(OperandBase::k32bit);
+  }
   return kChanged;
 }
 #endif