Regressions on trunk at revision 263228 vs revision 263207

[H.J. Lu (ia32 Core i7)]

New failures:

New passes:
FAIL: gcc.dg/pr84452.c (internal compiler error)
FAIL: gcc.dg/pr84452.c (test for excess errors)
FAIL: gcc.target/i386/pr84309.c (internal compiler error)
FAIL: gcc.target/i386/pr84309.c (test for excess errors)