[committed, pa] Update atomic support in PA backend

John David Anglin dave.anglin@bell.net
Fri Sep 25 07:59:00 GMT 2015

The attached change updates the atomic support in the PA backend for hppa-linux.

1) It enables 64-bit sync builtin support,
2) It adds new atomic store patterns that are atomic with respect to the LWS
     compare and swap builtins in linux-atomic.c, and
3) Revises existing atomic load and store patterns to also use the LWS builtins.

Tested on hppa-unknown-linux-gnu with no observed regressions.  Committed
to trunk and gcc-5.

John David Anglin	dave.anglin@bell.net

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