llvm's integrated assembler does not accept spaces as macro argument
delimiter when targeting darwin. Using a explicit delimiter is a good
idea in principle since it makes case like 'macro 4 -2' vs 'macro 4 - 2'
clear.
* commit '9aa4592076d4dbb29d1198b0e258f9f85c0c00b5':
aarch64: assembler in clang-3.4 ignores the division by two
Merged-by: Michael Niedermayer <michaelni@gmx.at>