[PATCH 2/4] gas: add visibility support using GNU syntax on XCOFF

[CHIGOT, CLEMENT]

In order to ease port of GNU assembly code and especially ld testsuite,
this patch allows XCOFF to accept the usual GNU syntax for visibility.

PR 22085

gas/ChangeLog:

	* config/tc-ppc.c (ppc_GNU_visibility): New function.
	* testsuite/gas/ppc/aix.exp: Add new tests.
	* testsuite/gas/ppc/xcoff-visibility-2-32.d: New test.
	* testsuite/gas/ppc/xcoff-visibility-2-64.d: New test.
	* testsuite/gas/ppc/xcoff-visibility-2.s: New test.
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