[committed] Add comment to gcc.dg/atomic/stdatomic-flag.c regarding xfail

[John David Anglin]

The attached change adds a requested comment regarding the xfail.

Tested on hppa2.0w-hp-hpux11.11 and hppa64-hp-hpux11.11.  Committed to
trunk and 4.9 branch.

Dave
--
John David Anglin	dave.anglin@bell.net


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