[PATCH] Improve performance of vector code on A15

[James Molloy]

Hi,

Attached is a patch which improves performance of vector code on
Cortex-A15.

Certain code sequences, where an S register is written but read as a D
register, can execute slowly. This patch defines a pass which detects
when SPRs are written but read as DPRs and inserts code sequences which,
although nonobvious, make code run much quicker.

The second patch, implicit-ops.diff, fixes an unrelated bug with
implicit defs/uses that happens to impact the A15 pass's efficiency.

Please review!

Cheers,

James

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