[PATCH] standardize {pred, succ, use, user}_{size, empty} like in MBB

[Ramkumar Ramachandra]

Drop .size() functions, because they don't make any sense; it's
cheaper to do std::distance(.begin(), .end()). Put in a bunch of
usecases to support the .empty().


http://reviews.llvm.org/D6944

Files:
  include/llvm/IR/CFG.h
  include/llvm/IR/Value.h
  lib/Analysis/CFG.cpp
  lib/IR/Verifier.cpp
  lib/Transforms/IPO/PruneEH.cpp
  lib/Transforms/Scalar/JumpThreading.cpp
  lib/Transforms/Scalar/Reg2Mem.cpp
  lib/Transforms/Utils/SimplifyCFG.cpp

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