ARM patch: Fix PR 40697

[Bernd Schmidt]

The ARM andsi3 expander has code to detect a case where, when generating
Thumb1 code, we can perform an AND by a sequence of two shifts.
Unfortunately, this code never triggers, as avoid_expensive_constant in
optabs.c prevents the expander from ever seeing a constant.

Fixed by tweaking the rtx costs.  Regression tested on arm-elf{,mthumb}.
 Ok (possibly for 4.6)?


Bernd
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