Regressions on master at commit r15-513 vs commit r15-508 on Linux/x86_64

[Haochen Jiang]

Regressions on master at commit r15-513 vs commit r15-508 on Linux/x86_64
New failures:
FAIL: gcc.dg/tree-ssa/ssa-lim-15.c scan-tree-dump lim2 "Executing store motion"
FAIL: gcc.dg/tree-ssa/ssa-lim-15.c scan-tree-dump lim2 "Executing store motion"
FAIL: g++.dg/tree-ssa/pr83215.C  -std=gnu++14  scan-tree-dump-times fre1 "\\*i" 1
FAIL: g++.dg/tree-ssa/pr83215.C  -std=gnu++14  scan-tree-dump-times fre1 "\\*i" 1
FAIL: g++.dg/tree-ssa/pr83215.C  -std=gnu++17  scan-tree-dump-times fre1 "\\*i" 1
FAIL: g++.dg/tree-ssa/pr83215.C  -std=gnu++17  scan-tree-dump-times fre1 "\\*i" 1
FAIL: g++.dg/tree-ssa/pr83215.C  -std=gnu++20  scan-tree-dump-times fre1 "\\*i" 1
FAIL: g++.dg/tree-ssa/pr83215.C  -std=gnu++20  scan-tree-dump-times fre1 "\\*i" 1
FAIL: g++.dg/tree-ssa/pr83215.C  -std=gnu++98  scan-tree-dump-times fre1 "\\*i" 1
FAIL: g++.dg/tree-ssa/pr83215.C  -std=gnu++98  scan-tree-dump-times fre1 "\\*i" 1
FAIL: gfortran.dg/vect/vect-do-concurrent-1.f90   -O   at line 14 (test for warnings, line )

New passes: