[PATCH, v2] ARM: fix inline atomic handling

[Phoebe Buckheister]

... forgot the actual patch, sorry for the noise.

Another try at allowing inline atomics whenever available, this time
including a testcase that checks for availability of some atomics on a
few targets. Enumerating all atomics for all platforms seems a bit
pointless because we already have tests for all supported atomics for
a number of targets, so availability checks should suffice.
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