i#58 MacOS: add support for 7th arg to dynamorio_syscall
i#58 MacOS: add support for 7th arg to dynamorio_syscall

For handling 64-bit args to 6-arg 32-bit syscalls, we take in a 7th arg to
dynamorio_syscall for the other half of the 64-bit value.

SVN-Revision: 2467

bl4ckic3/dynamorio,sigma-random/dynamorio,sigma-random/dynamorio,bl4ckic3/dynamorio,bl4ckic3/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,sigma-random/dynamorio,AmesianX/dynamorio,code4bones/dynamorio,sigma-random/dynamorio,daksunt/dynamorio,code4bones/dynamorio,code4bones/dynamorio,daksunt/dynamorio,sigma-random/dynamorio,daksunt/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,bl4ckic3/dynamorio,daksunt/dynamorio,daksunt/dynamorio,code4bones/dynamorio,bl4ckic3/dynamorio