Rollup merge of #126263 - nikic:s390x-codegen-test-fix, r=jieyouxu

Make issue-122805.rs big endian compatible

Instead of not generating the function at all on big endian (which makes the CHECK lines fail), instead use to_le() on big endian, so that we essentially perform a bswap for both endiannesses.

tests/codegen/issues/issue-122805.rs

@@ -39,17 +39,20 @@
 // OPT3WINX64-NEXT: store <8 x i16>
 // CHECK-NEXT: ret void
 #[no_mangle]
-#[cfg(target_endian = "little")]
 pub fn convert(value: [u16; 8]) -> [u8; 16] {
+ #[cfg(target_endian = "little")]
+ let bswap = u16::to_be;
+ #[cfg(target_endian = "big")]
+ let bswap = u16::to_le;
  let addr16 = [
- value[0].to_be(),
- value[1].to_be(),
- value[2].to_be(),
- value[3].to_be(),
- value[4].to_be(),
- value[5].to_be(),
- value[6].to_be(),
- value[7].to_be(),
+ bswap(value[0]),
+ bswap(value[1]),
+ bswap(value[2]),
+ bswap(value[3]),
+ bswap(value[4]),
+ bswap(value[5]),
+ bswap(value[6]),
+ bswap(value[7]),
  ];
  unsafe { core::mem::transmute::<_, [u8; 16]>(addr16) }
 }