[libcxx-commits] [libcxxabi] [libc++abi] Always use thread_local for cxa_exception_storage (PR #79868)

[Sean Perry via libcxx-commits]

perry-ca wrote:

z/OS doesn't fully support thread local storage yet.  The current state is:
- LE 3.1 has TLS for 64-bit with no C++ constructor/destructor support
- no 32-bit support, and no support on LE 2.5 which is also supported for libc++

https://github.com/llvm/llvm-project/pull/79868