libsanitizer: Fix Solaris 11.3 compilation [PR105531]

libsanitizer: Fix Solaris 11.3 compilation [PR105531]

The libsanitizer build has been broken on Solaris 11.3 by the latest
import.  An upstream patch to fix this has now been committed:

	[sanitizer_common] Support Solaris < 11.4 in GetStaticTlsBoundary
        https://reviews.llvm.org/D120059

I'd like to cherry-pick it into libsanitizer, too.

Bootstrapped without regressions on sparc-sun-solaris2.11,
i386-pc-solaris2.11 (both Solaris 11.3 and 11.4), and
x86_64-pc-linux-gnu.

2022-07-21  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	libsanitizer:
	PR sanitizer/105531
	* sanitizer_common/sanitizer_linux_libcdep.cpp,
	sanitizer_common/sanitizer_solaris.h:: Cherry-pick
	llvm-project revision 3776db9a4fd2080d23d6a5f52e405eea44558761.