mm/powerpc: define pXd_large() with pXd_leaf()

Patch series "mm/treewide: Replace pXd_large() with pXd_leaf()", v3.

These two APIs are mostly always the same.  It's confusing to have both of
them.  Merge them into one.  Here I used pXd_leaf() only because
pXd_leaf() is a global API which is always defined, while pXd_large() is
not.

We have yet one more API that is similar which is pXd_huge(), but that's
even trickier, so let's do it step by step.

Some special cares are taken for ppc and x86, they're done as separate
cleanups first.  


This patch (of 10):

The two definitions are the same.  The only difference is that pXd_large()
is only defined with THP selected, and only on book3s 64bits.

Instead of implementing it twice, make pXd_large() a macro to pXd_leaf(). 
Define it unconditionally just like pXd_leaf().  This helps to prepare
merging the two APIs.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Peter Xu <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Mike Rapoport (IBM) <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: "Aneesh Kumar K.V" <[email protected]>
Cc: "Naveen N. Rao" <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: Yang Shi <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Andrey Konovalov <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Vincenzo Frascino <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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