include: Fix ReadNoFence64 on i386.
64-bit volatile accesses are not atomic on i386. Both i686-w64-mingw32-gcc and x86 MSVC splits 64-bit loads into a pair of load/store ops.
Fix this by using a FILD/FISTP pair, which is also used to implement C11 atomics by i686-w64-mingw32-gcc.
Fixes: f82b1c1f
Edited by Jinoh Kang