RFR(XS): 8155738: C2: fix frame_complete_offset

[Lindenmaier, Goetz]

Hi,

In C2, frame_complete_offset is set wrong.  It's also called during scratch_emit_size,
which happens at least in the debug build.
I also added the missing call on ppc.

Please review this small fix.  I please need a sponsor:
http://cr.openjdk.java.net/~goetz/wr16/8155738-frameCmplt/webrev.00/

Thanks and best regards,
  Goetz.
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