[Issue 20118] rt/trace: rdtsc is unordered without preceding memory barrier

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20118

--- Comment #1 from Hiroki Noda <kubo39 at gmail.com> ---
I tried to fix on x86_64 only. https://github.com/dlang/druntime/pull/2727

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