Pass -fcrash-diagnostics-dir along to LLVM

This allows frontend and backend diagnostic files to all go into the
same place.  Have it control the Windows (mini-)dump location.

Differential Revision: https://reviews.llvm.org/D99199

GitOrigin-RevId: 04b3c8c52c549ee57e69a1b23484b8c4109f83b8
2 files changed