Regressions on trunk at revision 266658 vs revision 266611

[H.J. Lu (Intel64)]

New failures:
FAIL: gcc.target/i386/ipa-stack-alignment-2.c scan-assembler sub.*%.sp
FAIL: gcc.target/i386/ipa-stack-alignment-2.c scan-assembler sub.*%.sp

New passes:
FAIL: gcc.target/i386/pr34256.c scan-assembler-times mov 2