Eric van Gyzen 984969cd96 Fix reporting of SS_ONSTACK
Fix reporting of SS_ONSTACK in nested signal delivery when sigaltstack()
is used on some architectures.

Add a unit test for this.  I tested the test by introducing the bug
on amd64.  I did not test it on other architectures.

Reviewed by:	kib
MFC after:	2 weeks
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D18347
2018-11-30 22:44:33 +00:00
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