RFR(XS): 8035970: PPC64: fix ad file after 8027754: Enable loop optimizations for loops with MathExact

[Lindenmaier, Goetz]

Hi,

please review and test this tiny change.
It needs to go to hs-comp to fix the ppc64 build after 8027754.
http://cr.openjdk.java.net/~goetz/webrevs/8035970/

thanks and best regards,
  Goetz.