mm: move FAULT_FLAG_VMA_LOCK check from handle_mm_fault()

Handle a little more of the page fault path outside the mmap sem.  The
hugetlb path doesn't need to check whether the VMA is anonymous; the
VM_HUGETLB flag is only set on hugetlbfs VMAs.  There should be no
performance change from the previous commit; this is simply a step to ease
bisection of any problems.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Reviewed-by: Suren Baghdasaryan <[email protected]>
Cc: Arjun Roy <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Punit Agrawal <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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