Regressions on native/master at commit r12-7647 vs commit r12-7644 on Linux/x86_64

[H. J. Lu]

New failures:

New passes:
FAIL: libitm.c/memcpy-1.c (internal compiler error: in extract_insn, at recog.cc:2769)
FAIL: libitm.c/memcpy-1.c (test for excess errors)
FAIL: libitm.c/memset-1.c (internal compiler error: in extract_insn, at recog.cc:2769)
FAIL: libitm.c/memset-1.c (test for excess errors)