[PATCH][ARM][gas] Warn on deprecated ldm r<n>, {..., sp,...} and ldm r<n>, {...,lr,pc,...} forms

[Kyrill Tkachov]

Hi all,

ARMv7-A deprecates ldm instructions that use the SP register in their list
as well as ldm instructions that use both LR and PC. GAS should warn 
about them.

This patch adds a warning for these forms.
Tests are added/updated.

Tested check-gas in arm-none-eabi and I've had it sitting in my tree 
being tested
with gcc for a few months now.

What do people think?

Thanks,
Kyrill

[gas/]
2015-01-14  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * config/tc-arm.c (encode_ldmstm): Add deprecation warning when
     SP or both LR and PC are used in ldm register list.

[gas/testsuite]
2015-01-14  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * gas/cfi/cfi-arm-1.s: Change usage of sp to ip in 'ldmea'.
     * gas/arm/arm-ldm-bad.s: New file.
     * gas/arm/arm-ldm-bad.d: Likewise.
     * gas/arm/arm-ldm-bad.l: Likewise.
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