[PATCH] Add read_write_arg_mem attribute

[Igor Laevsky]

In http://reviews.llvm.org/D10398#187332, @igor-laevsky wrote:

> If user wants to encode function which can read and write only from specific set of arguments he can use readonly or readnone attributes. I will add a test for this case.


Actually this does not work :) But it's easy to fix, so I will send a separate follow-up patch.


http://reviews.llvm.org/D10398

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