re PR sanitizer/79341 (Many Asan tests fail on s390)

	PR sanitizer/79341
	* configure.tgt (s390*-*-linux*): Don't disable libsanitizer on
	s390-linux 31-bit.
	* sanitizer_common/sanitizer_internal_defs.h: Cherry-pick upstream
	r294793.
	* sanitizer_common/sanitizer_common_interceptors.inc: Cherry-pick
	upstream r294790.
	* sanitizer_common/sanitizer_linux_s390.cc: Cherry-pick upstream
	r294799.

From-SVN: r245350