7b9f5ceef1
Apparently on Solaris 10 a SA_SIGINFO signal handler can be invoked with
a nil info argument. I would not have believed it but I've now seen it
happen, and the sigaction man page actually says "If the second argument
is not equal to NULL, it points to a siginfo_t structure...." So, if
that happens, don't crash.
Also fix another case where we want to make sure that &T{} does not
allocate.
Reviewed-on: https://go-review.googlesource.com/33150
From-SVN: r242403
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