Regressions on trunk at revision 275501 vs revision 275450

[H.J. Lu (Intel64 AVX512)]

New failures:

New passes:
FAIL: gcc.target/x86_64/abi/ms-sysv/ms-sysv.c -mcall-ms2sysv-xlogues -O2 "-DGEN_ARGS=-p5" execution test
FAIL: gcc.target/x86_64/abi/ms-sysv/ms-sysv.c  -O2 "-DGEN_ARGS=-p5" execution test
FAIL: g++.dg/ubsan/pr59415.C   -O2 -flto -fno-use-linker-plugin -flto-partition=none  (test for excess errors)
FAIL: g++.dg/ubsan/pr59415.C   -O2 -flto -fno-use-linker-plugin -flto-partition=none  (test for excess errors)
FAIL: g++.dg/ubsan/pr59415.C   -O2 -flto -fno-use-linker-plugin -flto-partition=none  (test for excess errors)
FAIL: g++.dg/ubsan/pr59415.C   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  (test for excess errors)
FAIL: g++.dg/ubsan/pr59415.C   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  (test for excess errors)
FAIL: g++.dg/ubsan/pr59415.C   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  (test for excess errors)