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FEX was incorrectly invalidating RBX and RBP when a new thread/clone/fork was created. Only RAX should be set to zero to signify that it is the child process. I tried to find some reference as to why this was being done in FEX, and I seem to recall some code somewhere that was setting up this state. Sadly I can't seem to find any reference to this being required now by the linux kernel when it creates new processes, so maybe I was just gaslighting myself. Fixes crash in bubblewrap where it was expecting a valid RBP to exist after it does a clone syscall. I have unit tests coming for this but it is uncovering some more bugs in FEX's thread handling. Some of which are getting fixed with the current PRs that are moving the thread handling to the frontend. But since proton is broken now, this needs to get in.