Regressions on native/master at commit r16-629 vs commit r16-613 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r16-629 vs commit r16-613 on Linux/x86_64
New failures:

New passes:
FAIL: gcc.target/i386/pr78794.c scan-assembler pandn