Dump IR after PPC-specific passes

[Sebastian Pop]

Krzysztof Parzyszek wrote:
> 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.

LGTM.  Please wait for Hal or another PPC backend maintainer to also comment on
the patch.

Sebastian
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