pgsql: Add ARM64 (aarch64) support to s_lock.h.

Add ARM64 (aarch64) support to s_lock.h.

Use the same gcc atomic functions as we do on newer ARM chips.
(Basically this is a copy and paste of the __arm__ code block,
but omitting the SWPB option since that definitely won't work.)

Back-patch to 9.2. The patch would work further back, but we'd also
need to update config.guess/config.sub in older branches to make them
build out-of-the-box, and there hasn't been demand for it.

Mark Salter

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/5c7603c318872a42e1665b228f68fdf58714d945

Modified Files
--------------
src/include/storage/s_lock.h | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)

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