Regressions on trunk at revision 272711 vs revision 272688

[H.J. Lu (Intel64 -fpic -mcmodel=medium -mcmodel=large)]

New failures:
FAIL: gcc.dg/tree-ssa/pr84512.c scan-tree-dump optimized "return 285;"
FAIL: gcc.dg/tree-ssa/pr84512.c scan-tree-dump optimized "return 285;"
FAIL: gcc.dg/tree-ssa/pr84512.c scan-tree-dump optimized "return 285;"

New passes: