Regressions on trunk at revision 239751 vs revision 239731

[H.J. Lu Intel64]

New failures:

New passes:
FAIL: gcc.dg/tree-ssa/prefetch-7.c scan-assembler-times prefetchnta 1
FAIL: gcc.dg/tree-ssa/prefetch-7.c scan-assembler-times prefetcht 1
FAIL: gcc.dg/tree-ssa/prefetch-7.c scan-assembler-times prefetchw 5