[PATCH] Unify emit_{pre,post}_atomic_barrier across Alpha, ARM, MIPS and TileGX

[Maxim Kuvyrkov]

As suggested by Hans-Peter this patch unifies logic for emitting pre- and 
post-barriers for atomic operations across Alpha, ARM, MIPS and TileGX.  
Currently these targets use copy-pasted switch statements and this patch cleans 
that up.

I'm going to test this patch on MIPS, and I would appreciate target maintainers 
to cast a close look at the changes for their targets.  The changes are simple, 
but you can never eliminate typo mistakes.

Thank you,

--
Maxim Kuvyrkov
CodeSourcery / Mentor Graphics

0001-Unify-emit_-pre-post-_atomic_barrier-across-Alpha-AR.patch
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