Regressions on trunk at revision 187015 vs revision 187001

[H.J. Lu Intel64 LTO/FDO]

New failures:
FAIL: gcc.dg/lower-subreg-1.c scan-rtl-dump subreg1 "Splitting reg"
FAIL: gcc.dg/pch/save-temps-1.c  -O0 -g assembly comparison
FAIL: gcc.target/i386/movbe-2.c scan-assembler-times movbe[ \t] 4

New passes: