[PATCH][AARCH64] Restrict "m" constraint for narrow moves

[Sofiane Naci]

Hi,

Loads and stores with PC-relative addresses are not supported for SHORT
modes. This patch fixes a silent bug and implements this restriction for the
generic "m" constraint.

Tested successfully on aarch64-none-elf.

OK for trunk?

Thanks
Sofiane

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2013-03-25  Sofiane Naci  <sofiane.naci@arm.com>

	* config/aarch64/aarch64.c (aarch64_classify_address): Support
	PC-relative load in SI modes and above only.
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