[llvm] [WebAssembly] Fix missed optimization in 50142 (PR #144741)

[Luke Lau via llvm-commits]

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+; RUN: llc < %s -asm-verbose=false -verify-machineinstrs -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -mattr=+simd128 | FileCheck %s
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lukel97 wrote:

You probably want to use ./utils/update_llc_test_checks.py to generate these, since they're much easier to update if any of the codegen ever changes, I think simd-arith.ll has an example of what it looks like

https://github.com/llvm/llvm-project/pull/144741