fix #37673

Author: Jorge Aparicio

src/librustc_trans/mir/rvalue.rs

@@ -729,11 +729,13 @@ fn get_overflow_intrinsic(oop: OverflowOp, bcx: &BlockAndBuilder, ty: Ty) -> Val
 
     let new_sty = match ty.sty {
         TyInt(Is) => match &tcx.sess.target.target.target_pointer_width[..] {
+            "16" => TyInt(I16),
             "32" => TyInt(I32),
             "64" => TyInt(I64),
             _ => panic!("unsupported target word size")
         },
         TyUint(Us) => match &tcx.sess.target.target.target_pointer_width[..] {
+            "16" => TyUint(U16),
             "32" => TyUint(U32),
             "64" => TyUint(U64),
             _ => panic!("unsupported target word size")