Regressions on trunk at revision 156423 vs revision 156393

[H.J. Lu]

New failures:
FAIL: gcc.dg/torture/pr42898.c  -O1  scan-tree-dump-times optimized "\*ptr" 1
FAIL: gcc.dg/torture/pr42898.c  -O2  scan-tree-dump-times optimized "\*ptr" 1
FAIL: gcc.dg/torture/pr42898.c  -O2 -flto  scan-tree-dump-times optimized "\*ptr" 1
FAIL: gcc.dg/torture/pr42898.c  -O2 -fwhopr  scan-tree-dump-times optimized "\*ptr" 1
FAIL: gcc.dg/torture/pr42898.c  -O3 -fomit-frame-pointer  scan-tree-dump-times optimized "\*ptr" 1
FAIL: gcc.dg/torture/pr42898.c  -O3 -g  scan-tree-dump-times optimized "\*ptr" 1
FAIL: gcc.dg/torture/pr42898.c  -Os  scan-tree-dump-times optimized "\*ptr" 1

New passes: