[LoongArch] Improve codegen for i8/i16 'atomicrmw xchg a, {0,-1}'
Similar to D156801 for RISCV. Link: https://github.com/rust-lang/rust/pull/114034 Link: https://github.com/llvm/llvm-project/issues/64090 Reviewed By: SixWeining, xen0n Differential Revision: https://reviews.llvm.org/D159252
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