Regressions on trunk at revision 263860 vs revision 263854

[H.J. Lu (ia32 -fpic)]

New failures:
FAIL: gcc.c-torture/execute/builtins/strnlen.c compilation,  -O1  (internal compiler error)
FAIL: gcc.c-torture/execute/builtins/strnlen.c compilation,  -Og -g  (internal compiler error)
FAIL: gcc.c-torture/execute/builtins/strnlen.c compilation,  -Os  (internal compiler error)
FAIL: gcc.target/i386/avx512vl-pr79299-2.c (test for excess errors)

New passes: