[PowerPC] Disable part-word atomics on the P7
As it turns out, even though these are part of ISA 2.06, the P7 does not support them (or, at least, not any P7s we're tested so far). llvm-svn: 234686
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As it turns out, even though these are part of ISA 2.06, the P7 does not support them (or, at least, not any P7s we're tested so far). llvm-svn: 234686