mm: export __get_user_pages

In most cases, get_user_pages and get_user_pages_fast should be used
to pin user pages in memory.  But sometimes, some special flags except
FOLL_GET, FOLL_WRITE and FOLL_FORCE are needed, for example in
following patch, KVM needs FOLL_HWPOISON.  To support these users,
__get_user_pages is exported directly.

There are some symbol name conflicts in infiniband driver, fixed them too.

Signed-off-by: Huang Ying <[email protected]>
CC: Andrew Morton <[email protected]>
CC: Michel Lespinasse <[email protected]>
CC: Roland Dreier <[email protected]>
CC: Ralph Campbell <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>

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