[asan] Support handle_sigill on Darwin

Handling SIGILL on Darwin works fine, so let's just make this feature work and re-enable the ill.cc testcase.

Differential Revision: https://reviews.llvm.org/D27141



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@287959 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed