[Issue 12873] Valgrind unhandled instruction bytes 0x48 0xDB (redundant REX_W prefix on x87 load)

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12873

--- Comment #4 from yebblies <yebblies at gmail.com> ---
Is this really wrong-code?  I'd say it's just a workaround for a valgrind bug,
and a minor code-size optimization.

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