[z/OS] Add backtrace support for z/OS. (#121826) The system call `__CELQTBCK()` is used to build a backtrace like on other systems. The collected information are the address of the PC, the address of the entry point (EP), the difference between both addresses (+EP), the dynamic storage area (DSA aka the stack pointer), and the function name. The system call is described here: https://www.ibm.com/docs/en/zos/3.1.0?topic=cwicsa6a-celqtbck-also-known-as-celqtbck-64-bit-traceback-service
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