Regressions on trunk at revision 256895 vs revision 256889

[H.J. Lu Intel64 Core i7]

New failures:
FAIL: libstdc++-prettyprinters/80276.cc whatis p4
FAIL: libstdc++-prettyprinters/80276.cc whatis p4

New passes:
FAIL: g++.dg/torture/pr83619.C   -O0   (test for warnings, line 27)
FAIL: g++.dg/torture/pr83619.C   -O0   (test for warnings, line 27)
FAIL: g++.dg/torture/pr83619.C   -O1   (test for warnings, line 27)
FAIL: g++.dg/torture/pr83619.C   -O1   (test for warnings, line 27)
FAIL: g++.dg/torture/pr83619.C   -O2 -flto -fno-use-linker-plugin -flto-partition=none   (test for warnings, line 27)
FAIL: g++.dg/torture/pr83619.C   -O2 -flto -fno-use-linker-plugin -flto-partition=none   (test for warnings, line 27)
FAIL: g++.dg/torture/pr83619.C   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects   (test for warnings, line 27)
FAIL: g++.dg/torture/pr83619.C   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects   (test for warnings, line 27)
FAIL: g++.dg/torture/pr83619.C   -O2   (test for warnings, line 27)
FAIL: g++.dg/torture/pr83619.C   -O2   (test for warnings, line 27)
FAIL: g++.dg/torture/pr83619.C   -O3 -g   (test for warnings, line 27)
FAIL: g++.dg/torture/pr83619.C   -O3 -g   (test for warnings, line 27)
FAIL: g++.dg/torture/pr83619.C   -Os   (test for warnings, line 27)
FAIL: g++.dg/torture/pr83619.C   -Os   (test for warnings, line 27)