[Atomics] Fix disassembly for ia32 xchg_b and xchg_w
https://codereview.chromium.org/1938213002 added xchg_b and xchg_w, but didn't add it to the disassembler, and there were no tests that caught it. BUG=v8:4614 TBR=bmeurer@chromium.org LOG=n Review-Url: https://codereview.chromium.org/1947673002 Cr-Commit-Position: refs/heads/master@{#35998}
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