Regressions on master at commit r11-6076 vs commit r11-6032 on Linux/x86_64

[H.J. Lu]

New failures:
FAIL: g++.dg/pch/system-1.C  -g assembly comparison
FAIL: g++.dg/pch/system-1.C  -g assembly comparison
FAIL: g++.dg/pch/system-1.C  -g assembly comparison
FAIL: g++.dg/pch/system-1.C  -O2 assembly comparison
FAIL: g++.dg/pch/system-1.C  -O2 assembly comparison
FAIL: g++.dg/pch/system-1.C  -O2 assembly comparison
FAIL: g++.dg/pch/system-1.C  -O2 -g assembly comparison
FAIL: g++.dg/pch/system-1.C  -O2 -g assembly comparison
FAIL: g++.dg/pch/system-1.C  -O2 -g assembly comparison
FAIL: g++.dg/pch/system-2.C  -g assembly comparison
FAIL: g++.dg/pch/system-2.C  -g assembly comparison
FAIL: g++.dg/pch/system-2.C  -g assembly comparison
FAIL: g++.dg/pch/system-2.C  -O2 assembly comparison
FAIL: g++.dg/pch/system-2.C  -O2 assembly comparison
FAIL: g++.dg/pch/system-2.C  -O2 assembly comparison
FAIL: g++.dg/pch/system-2.C  -O2 -g assembly comparison
FAIL: g++.dg/pch/system-2.C  -O2 -g assembly comparison
FAIL: g++.dg/pch/system-2.C  -O2 -g assembly comparison
FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++14 (test for excess errors)
FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++14 (test for excess errors)
FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++14 (test for excess errors)
FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++17 (test for excess errors)
FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++17 (test for excess errors)
FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++17 (test for excess errors)
FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++2a (test for excess errors)
FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++2a (test for excess errors)
FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++2a (test for excess errors)

New passes:
FAIL: gcc.dg/lto/save-temps c_lto_save-temps_0.o-c_lto_save-temps_0.o link,  -O -flto -save-temps
FAIL: gcc.target/i386/pr78102.c scan-assembler-times pcmpeqq 3
FAIL: gcc.target/i386/pr78102.c scan-assembler-times pcmpeqq 3
FAIL: gcc.target/i386/pr78102.c scan-assembler-times pcmpeqq 3