Regressions on trunk at revision 247666 vs revision 247642

[H.J. Lu ia32 -fpic]

New failures:

New passes:
FAIL: gcc.dg/pr78138.c  (test for warnings, line 23)
FAIL: gcc.dg/pr78138.c (test for excess errors)
FAIL: gcc.dg/pr79214.c  (test for warnings, line 52)
FAIL: gcc.dg/pr79214.c  (test for warnings, line 59)
FAIL: gcc.dg/pr79214.c  (test for warnings, line 73)
FAIL: gcc.dg/pr79214.c (test for excess errors)
FAIL: gcc.dg/pr79222.c  (test for warnings, line 12)
FAIL: gcc.dg/pr79222.c (test for excess errors)
FAIL: gcc.dg/tree-ssa/builtins-folding-gimple-ub.c (test for excess errors)