K 10
svn:author
V 6
luporl
K 8
svn:date
V 27
2019-10-31T12:03:47.815297Z
K 7
svn:log
V 301
Fix GDB machdep code for PPC/PPC64

There was a couple issues with GDB machdep code for PPC/PPC64, the main ones being:
- wrong register sizes being returned
- pcb_context index was wrong (this affects all PPC variants)

Reviewed by:	jhibbits
Differential Revision:	https://reviews.freebsd.org/D22201

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