[PATCH] ARM: Use LDRD and STRD for 64-bit spills

[Tim Northover]

Hi,

At the suggestion of Jakob, I've converted the spill/restore code to
use LDRD and STRD instructions instead of LDM/STM for 64-bit paired
registers. They're often faster and can contain a small offset too,
but are only present on newer architecture revisions.

I *think* I've got all of the details right and put things in the
correct places, but would welcome a quick check from someone else.

Ok to commit?

Cheers.

Tim.
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