K 10
svn:author
V 7
bdragon
K 8
svn:date
V 27
2020-01-17T23:41:35.904632Z
K 7
svn:log
V 427
[PowerPC] Save a dword in the powerpc64 signal trampoline

In r291668, an instruction was added to sigcode64.S without the nop pad at
the end being taken out.

Due to alignment, this means that a dword is being wasted on the shared
page for no reason.

Take out this nop, and add some comments while I'm here.

Reviewed by:	jhibbits
Sponsored by:	Tag1 Consulting, Inc.
Differential Revision:	https://reviews.freebsd.org/D23055

END