libsanitizer: Fix SPARC stacktraces

As detailed in LLVM Issue #57624
(https://github.com/llvm/llvm-project/issues/57624), a patch to
sanitizer_internal_defs.h broke SPARC stacktraces in the sanitizers.
The issue has now been fixed upstream (https://reviews.llvm.org/D156504)
and I'd like to cherry-pick that patch.

Bootstrapped without regressions on sparc-sun-solaris2.11.

2023-07-27  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	libsanitizer:
	* sanitizer_common/sanitizer_stacktrace_sparc.cpp,
	sanitizer_common/sanitizer_unwind_linux_libcdep.cpp: Cherry-pick
	llvm-project revision 679c076ae446af81eba81ce9b94203a273d4b88a.