Regressions on trunk at revision 244255 vs revision 244227

[H.J. Lu ia32 -fpic]

New failures:

New passes:
FAIL: g++.dg/cpp1z/constexpr-if10.C   (test for excess errors)
FAIL: gcc.dg/tree-ssa/dse-points-to.c scan-tree-dump-times dse1 "Deleted dead store.*p_1" 1
FAIL: gcc.target/i386/pr78904-2.c scan-assembler [ \t]addb[ \t]+t[^\n\r]*, %.h
FAIL: gcc.target/i386/pr78904-2.c scan-assembler [ \t]andb[ \t]+t[^\n\r]*, %.h
FAIL: gcc.target/i386/pr78904-2.c scan-assembler [ \t]orb[ \t]+t[^\n\r]*, %.h
FAIL: gcc.target/i386/pr78904-2.c scan-assembler [ \t]xorb[ \t]+t[^\n\r]*, %.h
FAIL: gcc.target/i386/pr78904-4.c scan-assembler [ \t]movb[\t ]+%.h, t
FAIL: gcc.target/i386/pr78904-6.c scan-assembler [ \t]movb[\t ]*%.h, t
FAIL: gcc.target/i386/pr78967-2.c scan-assembler [ \t]movb[ \t]+t[^\n\r]*, %.h