[libcxx] [libcxxabi] [libunwind] [libc++/libc++abi/libunwind] Add new test configs for Clang runtime library. NFC. (PR #82734)

[Vladimir Vereschaka via cfe-commits]

vvereschaka wrote:

Also it fixes the `llvm-libc++-static.cfg.in::mul_sat.pass.cpp` test for some of the cross target builds
https://lab.llvm.org/buildbot/#/builders/143/builds/631/steps/14/logs/FAIL__llvm-libc__-static_cfg_in__mul_sat_pass_cpp

https://github.com/llvm/llvm-project/pull/82734