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[arm] inhibit LDM peepholes for xscale

When tuning for xscale, peepholing two LDRs into an LDM would generally
be a loss.

In fact, arith_adjacentmem looks like it will sometimes transform two
LDRs into an ADD followed by an LDM, which is probably a loss on any
Harvard core.  But I guess we can worry about that separately.

p.

Attachment: ldm2.diff
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