libsanitizer - remove reference to __cxa_rethrow_primary_exception.

libsanitizer - remove reference to __cxa_rethrow_primary_exception.

For some Darwin versions the absence of the rethrow_primary_exception
symbol causes almost all sanitizer tests to fail.
The symbol is not present in libstdc++ and, therefore is is correct to
remove the reference to it for all platforms.  We do this by adding a
new guard "ASAN_HAS_CXA_RETHROW_PRIMARY_EXCEPTION".

libsanitizer/

2019-06-18  Iain Sandoe  <iain@sandoe.co.uk>

	PR libsanitizer/87880
	* asan/asan_interceptors.h:
	(ASAN_INTERCEPT___CXA_RETHROW_PRIMARY_EXCEPTION): New.
	* asan/Makefile.am (DEFS): Add
	ASAN_HAS_CXA_RETHROW_PRIMARY_EXCEPTION, defined to 0.
	* asan/Makefile.in: Regenerated.
	* asan/libtool-version: Bump version.

From-SVN: r272406