i#1714 windows 10: wow64 call conversion
i#1714 windows 10: wow64 call conversion

Avoid attempts to convert the wow64 call* that we treat as a syscall
into a direct call by re-ordring the syscall check during bb creation.

Review-URL: https://codereview.appspot.com/258350043

code4bones/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,code4bones/dynamorio,daksunt/dynamorio,code4bones/dynamorio,daksunt/dynamorio,AmesianX/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,daksunt/dynamorio,daksunt/dynamorio,daksunt/dynamorio,AmesianX/dynamorio