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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