64-bit volatile accesses are not atomic on i386. Both
i686-w64-mingw32-gcc and x86 MSVC splits 64-bit loads into two
load/stores of a pair of 32-bit words.
Fix this by using FILD/FSTP pair, which is used to implement C11 atomics
by i686-w64-mingw32-gcc.
Fixes: f82b1c1fcf770a5d6fa02c3f286282be79a201b8
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https://gitlab.winehq.org/wine/wine/-/merge_requests/7237
