MFC 275336:

Use llabs when getting the absolute value of a long long.

Sponsored by:	ABT Ststems Ltd
MFC 275415:

Allow the UAL APSR_nzcv format for the mrc and mrc2 instructions. The clang
integrated assembler only allows these forms so binutils will need to
support them.

Sponsored by:	ABT Systems Ltd

MFC 275584:

Fix mrc and mrc2 with APSR_nzcv. Binutils encodes it internally as 0 where
we need it to be set to 15 for it to be equivalent to r15.

Sponsored by:	ABT Systems Ltd