[PATCH][ARM][gas] Accept narrow form of tst<condition> rd, rn in Thumb mode

[Kyrill Tkachov]

Hi all,

Currently gas fails to assemble:
.syntax unified
it  gt
tstgt.n r0, r4

It seems that it's trying to use a 32-bit encoding when it could use a narrow one.
This patch fixes that. tst doesn't have a "flag setting" variant ("tsts"?) since 
it's already flag setting, therefore in the do_t_mvn_tst function it should be 
treated similarly to cmn.

Tests are added and check-gas passes.

Ok to apply to trunk?

Thanks,
Kyrill

[gas/]
2013-10-04  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * config/tc-arm.c (do_t_mvn_tst): Use narrow form for tst when
     possible.


[gas/testsuite/]
2013-10-04  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * gas/arm/thumb2_it.s: Add test for narrow tst.
     * gas/arm/thumb2_it.d: Update expected output.
     * gas/arm/thumb2_it_auto.d: Likewise.
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