[compiler-rt] [compiler-rt] Add `DumpAllRegisters` impl (PR #99049)

[Dmitriy Chestnykh via llvm-commits]

chestnykh wrote:

@vitalybuka i've covered i386 arch and described in the last commit message why i restored common dump_register.cpp test and made two separate dump_register_<arch>.cpp tests instead

https://github.com/llvm/llvm-project/pull/99049