Regressions on trunk at revision 236931 vs revision 236921

[H.J. Lu x32]

New failures:

New passes:
FAIL: gcc.target/i386/avx512vl-vbroadcast-3.c scan-assembler-times vbroadcastss[^\n\r]*%rdi[^\n\r]*%xmm16 4
FAIL: gcc.target/i386/avx512vl-vbroadcast-3.c scan-assembler-times vbroadcastss[^\n\r]*%rdi[^\n\r]*%ymm16 3
FAIL: gcc.target/i386/avx512vl-vcvtps2ph-3.c scan-assembler vcvtps2ph[^\n\r]*\\$1[^\n\r]*%ymm16[^\n\r]*%rdi