[PATCH][GAS] aarch64: Add +pauth flag for Pointer Authentication feature

[Przemyslaw Wirkus]

New -march option +pauth enables PAuth vel PAC (Pointer Authentication)
feature.

Regression tested and no issues.

OK for master ?

gas/ChangeLog:

2020-11-13  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>

	* NEWS: Update news.
	* config/tc-aarch64.c: Add option +pauth to -march.
	* testsuite/gas/aarch64/pac-feat.d: New test.
	* testsuite/gas/aarch64/pac-feat.s: New test.
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