K 10
svn:author
V 10
nwhitehorn
K 8
svn:date
V 27
2015-03-08T19:37:08.484491Z
K 7
svn:log
V 460
Save and restore non-volatile floating-point registers during longjmp().
This should also save and restore non-volatile Altivec registers, but that
needs to wait on solving two problems:
1. Adding the nonvolatile vector registers means we need 5 more than _JBLEN
   entries in jmp_buf on 32-bit targets (64-bit is OK).
2. Need to figure out how to determine if saving/restoring vector regs
   is supported on the current CPU from userland.

MFC after:	1 month

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