[Bug target/68872] New: -mcpu=powerpc64le does not pass -mpower8 to gas

[amodra at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68872

            Bug ID: 68872
           Summary: -mcpu=powerpc64le does not pass -mpower8 to gas
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: amodra at gmail dot com
  Target Milestone: ---

This results in failures assembling "mfcr r,mask" and also wrong "at" branch
hints.  See https://sourceware.org/bugzilla/show_bug.cgi?id=19359 for a
testcase.