powerpc: atomic: Implement acquire/release/relaxed variants for xchg
Implement xchg{,64}_relaxed and atomic{,64}_xchg_relaxed, based on these _relaxed variants, release/acquire variants and fully ordered versions can be built. Note that xchg{,64}_relaxed and atomic_{,64}_xchg_relaxed are not compiler barriers. Signed-off-by: NBoqun Feng <boqun.feng@gmail.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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