Regressions on master at commit r17-415 vs commit r17-413 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r17-415 vs commit r17-413 on Linux/x86_64
New failures:

New passes:
FAIL: gcc.c-torture/execute/strlen-2.c   -O3 -g  (internal compiler error: 
Illegal instruction)
FAIL: gcc.c-torture/execute/strlen-2.c   -O3 -g  (test for excess errors)