[ASan] Move the signal handling-related flags to sanitizer_common.
This change is a part of refactoring intended to have common signal handling behavior in all tools.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@200295 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: relax checking of errno spoiling in signal handlers
allow SIGABRT to spoil errno, because some real programs
reset SIGABRT handler in the handler, re-raise SIGABRT and return from the handler



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@200304 91177308-0d34-0410-b5e6-96231b3b80d8