[Patch, ARM] Fix invalid immediate constant acceptance for carry-setting addw,subw.

[Tejas Belagod]

Hi,

Widening carry-setting thumb2 add and sub accepted invalid immediates
which were flat 12-bit encoded. ADDS.W and SUBS.W's immediates have to
be modified immediate constants(unlike addw and subw). Attached is a
patch that adds this check and fixes it in gas. Regression tested on
arm-none-eabi.

OK?

--
Tejas Belagod
ARM.

gas/testsuite/

2010-08-23 Tejas Belagod <tejas.belagod@arm.com>

	* gas/arm/addsw-bad.s: New file.
	* gas/arm/addsw-bad.l: New file.
	* gas/arm/addsw-bad.d: New file.

gas/

2010-08-23 Tejas Belagod <tejas.belagod@arm.com>

	* config/tc-arm.c (md_apply_fix): Check if widened add, sub are
	flag-setting and handle accordingly.
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