powerpc: Add macros to access floating point registers in thread_struct.
We are going to change where the floating point registers are stored in the thread_struct, so in preparation add some macros to access the floating point registers. Update all code to use these new macros. Signed-off-by: NMichael Neuling <mikey@neuling.org> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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