Fix a signal emulation bug introduced in r163018 (and present in 7.x). This prevents 32 bit signal handlers from finding out what the faulting address is.  Both the secret 4th argument and siginfo->si_addr are zero.
Fix a signal emulation bug introduced in r163018 (and present in 7.x).
This prevents 32 bit signal handlers from finding out what the faulting
address is.  Both the secret 4th argument and siginfo->si_addr are zero.

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