Regressions on native/master at commit r17-334 vs commit r17-326 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r17-334 vs commit r17-326 on Linux/x86_64
New failures:

New passes:
FAIL: gcc.dg/tree-ssa/pr122569-1.c scan-tree-dump forwprop1 
"__builtin_ctz|\\.CTZ"
FAIL: gcc.dg/tree-ssa/pr122569-2.c scan-tree-dump forwprop1 
"__builtin_clz|\\.CLZ"