MADV flags as mmap options

[Jamie Lokier <jamie.lokier@cern.ch>]

While we're here :-)

It seems to me that a lot of the time, madvise() will be called
immediately after mmap() on the same region.

How about making the MADV_ flags distinct from the MAP_ flags, and
arranging that you may pass MADV_ flags to mmap().  If it sees any, it
does the mapping and follows it by the corresponding madvise_vma call.

(Only really useful for MADV_RANDOM and MADV_SEQUENTIAL).

-- Jamie
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