Dump IR after PPC-specific passes

[Krzysztof Parzyszek]

Hi,
With -print-before-all or -print-after-all, the IR related to a given 
pass is shown only if the pass was registered.  Since some passes in the 
MI phase run without registering, these debug options do not show the IR 
before or after those passes.  This patch adds registration to the 
PPC-specific passes which lacked it.

Please review.

-Krzysztof


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