Regressions on native/master at commit r16-3925 vs commit r16-3916 on Linux/x86_64

[Haochen Jiang]

Regressions on master at commit r16-3925 vs commit r16-3916 on Linux/x86_64
New failures:

New passes:
FAIL: gcc.target/i386/avx512vl-vpmovuswb-2.c (test for excess errors)
FAIL: gcc.target/i386/avx512vl-vpmovuswb-2.c (test for excess errors)
FAIL: gcc.target/i386/avx512vl-vpmovwb-2.c (test for excess errors)
FAIL: gcc.target/i386/avx512vl-vpmovwb-2.c (test for excess errors)
FAIL: gcc.target/i386/vect-epilogues-4.c scan-tree-dump-times vect "loop vectorized using 64 byte vectors" 2
FAIL: gcc.target/i386/vect-epilogues-4.c scan-tree-dump-times vect "loop vectorized using 64 byte vectors" 2