Revert "Add a test for debug info with the safestack sanitizer enabled."

This reverts commit r299730.

It's causing failures on a bot because of missing compiler-rt:
http://green.lab.llvm.org/green/job/clang-stage2-cmake-RgSan_check

llvm-svn: 300460
GitOrigin-RevId: 27d260baec2ba68e61d078141aeb63d2615756eb
1 file changed