Make this build on clang architectures that don't have 64-bit atomic

instructions.  Clang doesn't allow redeclaration (and therefore
redefinition) of the __sync_* builtins.  Use #pragma redefine_extname
to work around that restriction.  Clang also turns __sync_add_and_fetch
into __sync_fetch_and_add (and __sync_sub_and_fetch into
__sync_fetch_and_sub) in certain cases, so provide these functions as
well.

ok jsg@

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