Kyle Butt 28b01a51b3 PPC: Teach FMA mutate to respect register classes. ...

This was causing bad code gen and assembly that won't assemble, as
mixed altivec and vsx code would end up with a vsx high register
assigned to an altivec instruction, which won't work. Constraining the
classes allows the optimization to proceed.

llvm-svn: 255299

2015-12-10 21:28:40 +00:00

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