K 10 svn:author V 10 nwhitehorn K 8 svn:date V 27 2013-11-11T17:37:50.746427Z K 7 svn:log V 354 Follow up r223485, which made AIM use the ABI thread pointer instead of PCPU fields for curthread, by doing the same to Book-E. This closes some potential races switching between CPUs. As a side effect, it turns out the AIM and Book-E swtch.S implementations were the same to within a few registers, so move that to powerpc/powerpc. MFC after: 3 months END