pgsql: Fix atomic ops inline x86 inline assembly for older 32bit gccs.

Fix atomic ops inline x86 inline assembly for older 32bit gccs.

Some x86 32bit versions of gcc apparently generate references to the
nonexistant %sil register when using when using the r input
constraint, but not with the =q constraint. The latter restricts
allocations to a/b/c/d which should all work.

Branch
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master

Details
-------
http://git.postgresql.org/pg/commitdiff/f18cad944911f05ad2e876af67362e28584b3c61

Modified Files
--------------
src/include/port/atomics/arch-x86.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

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