target-ppc: retain l{w,d}arx loaded value
We do this so we can check on the corresponding stc{w,d}x. whether the value has changed. It's a poor man's form of implementing atomic operations and is valid only for NPTL usermode Linux emulation. Signed-off-by: NNathan Froyd <froydnj@codesourcery.com> Signed-off-by: Nmalc <av1474@comtv.ru>
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