[Bug rtl-optimization/70907] New: [7 regression] FAIL: gcc.target/powerpc/savres.c -Os execution test

["schwab at linux-m68k dot org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70907

            Bug ID: 70907
           Summary: [7 regression] FAIL: gcc.target/powerpc/savres.c  -Os
                    execution test
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: schwab@linux-m68k.org
  Target Milestone: ---
            Target: powerpc*-*-*

This is another -frename-registers fallout.

$ gcc/xgcc -Bgcc/ ../gcc/testsuite/gcc.target/powerpc/savres.c -O2 -fno-inline
-fomit-frame-pointer -o savres
$ ./savres
Aborted

It aborts after b_cr, because the preceding cmpw clobbers cr2.