ICE when bootstrapping GCC 10 branch on x86_64-w64-mingw32

ICE when bootstrapping GCC 10 branch on x86_64-w64-mingw32

[Liu Hao]

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This error emerged ~10 days ago. Full log is attached.


```
In file included from E:/GitHub/MINGW-packages/mingw-w64-gcc-git/src/build-x86_64-w64-mingw32/gcc/include/immintrin.h:55,
                 from E:/GitHub/MINGW-packages/mingw-w64-gcc-git/src/build-x86_64-w64-mingw32/gcc/include/x86intrin.h:32,
                 from C:/MinGW/MSYS2/mingw64/x86_64-w64-mingw32/include/winnt.h:1555,
                 from C:/MinGW/MSYS2/mingw64/x86_64-w64-mingw32/include/minwindef.h:163,
                 from C:/MinGW/MSYS2/mingw64/x86_64-w64-mingw32/include/windef.h:9,
                 from C:/MinGW/MSYS2/mingw64/x86_64-w64-mingw32/include/windows.h:69,
                 from ../../../gcc-git/libgcc/libgcc2.c:2183:
E:/GitHub/MINGW-packages/mingw-w64-gcc-git/src/build-x86_64-w64-mingw32/gcc/include/avx512fintrin.h: In function
'_mm512_mask_reduce_mul_ps':
E:/GitHub/MINGW-packages/mingw-w64-gcc-git/src/build-x86_64-w64-mingw32/gcc/include/avx512fintrin.h:15958:3: internal
compiler error: Segmentation fault
15958 |   __A = _mm512_mask_mov_ps (_mm512_set1_ps (1.0f), __U, __A);
      |   ^~~
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc-mcf.lhmouse.com/> for instructions.
make[3]: *** [Makefile:501: _trampoline.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[3]: Leaving directory '/e/GitHub/MINGW-packages/mingw-w64-gcc-git/src/build-x86_64-w64-mingw32/x86_64-w64-mingw32/libgcc'
make[2]: *** [Makefile:17959: all-stage1-target-libgcc] Error 2
make[2]: Leaving directory '/e/GitHub/MINGW-packages/mingw-w64-gcc-git/src/build-x86_64-w64-mingw32'
make[1]: *** [Makefile:21867: stage1-bubble] Error 2
make[1]: Leaving directory '/e/GitHub/MINGW-packages/mingw-w64-gcc-git/src/build-x86_64-w64-mingw32'
make: *** [Makefile:1009: all] Error 2
==> ERROR: A failure occurred in build().
```




-- 
Best regards,
LH_Mouse

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