Revert "[sanitizer-coverage] one more flavor of coverage:...

Revert "[sanitizer-coverage] one more flavor of coverage: -fsanitize-coverage=inline-8bit-counters. Experimental so far, not documenting yet. (clang part)"

This reverts commit r304631, as it broke ARM/AArch64 bots for 2 days.

llvm-svn: 304697