Summary:
This patch adds signal support on Linux. The current implementation gets the SIG* macros and types like `sigset_t` from <linux/signals.h>
This patch also adds raise(3), and internal routines `block_all_signals` and `restore_signals`
Reviewers: sivachandra, MaskRay, gchatelet
Reviewed By: sivachandra
Subscribers: libc-commits, mgorny, tschuett
Differential Revision: https://reviews.llvm.org/D74528