Regressions on native/master at commit r16-4531 vs commit r16-4521 on Linux/x86_64

[Haochen Jiang]

Regressions on master at commit r16-4531 vs commit r16-4521 on Linux/x86_64
New failures:

New passes:
FAIL: gcc.dg/ipa/ipcp-cb1.c (test for excess errors)
FAIL: gcc.dg/ipa/ipcp-cb1.c (test for excess errors)
FAIL: gcc.dg/ipa/ipcp-cb-spec1.c (test for excess errors)
FAIL: gcc.dg/ipa/ipcp-cb-spec1.c (test for excess errors)
FAIL: gcc.dg/ipa/ipcp-cb-spec2.c (test for excess errors)
FAIL: gcc.dg/ipa/ipcp-cb-spec2.c (test for excess errors)