target-ppc: improve mfcr/mtcrf
- use ctz32 instead of ffs - 1 - small optimisation of mtcrf - add the name of both opcodes Signed-off-by: NAurelien Jarno <aurelien@aurel32.net> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6669 c046a42c-6fe2-441c-8c8c-71466251a162
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