Make PLT detection stricter.
Make PLT detection stricter.

For X86/X64/ARMxx, do not allow any reference to cc_* registers in the
decoded PLT blocks.

This commit fixes issue #339 on GitHub.

Signed-off-by: Fish <64875fcccaac069fcb3e0e201e7d5b9166641608@cs.ucsb.edu>

angr/cle