https://sourceware.org/bugzilla/show_bug.cgi?id=32813
--- Comment #5 from Andreas Abel <abel at cs dot uni-saarland.de> ---
If it is not a bug, but a conscious choice to prefer the form without the REX
prefix to optimize the instruction size, I would expect that `{nooptimize} LSL
RCX, RDX` has the prefix, but this is not the case either.
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