[Patch][gas][arm] Diagnose unpredictable mrrc, mrrc2 etc instructions

[Tamar Christina]

   Hi All,

When instructions such as MRRC are used with the same destination registers
then the result is unpredictable but no warning was issued to the user.

This patch adds a warning for this pattern to the instructions:

* MRRC
* MRRC2


Added new test for message and ran tests for gas for arm-none-linux-gnueabi:

Ok for trunk?

Thanks,
Tamar

gas/
2016-08-09  Tamar Christina  <tamar.christina@arm.com>

	* config/tc-arm.c (do_co_reg2c): Added constraint.

gas/testsuite/
2016-08-09  Tamar Christina  <tamar.christina@arm.com>

	* gas/arm/dest-unpredictable.s: New.
	* gas/arm/dest-unpredictable.l: New.
	* gas/arm/dest-unpredictable.d: New.
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