[PATCH] Rename *MatcherCreateCallback to *MatcherDesc, and its member run() to create().

[Peter Collingbourne]

  Closed by commit rL195539 (authored by @pcc).

CHANGED PRIOR TO COMMIT
  http://llvm-reviews.chandlerc.com/D2208?vs=5650&id=5745#toc

http://llvm-reviews.chandlerc.com/D2208

COMMIT
  http://llvm-reviews.chandlerc.com/rL195539