[PATCH] Kill some duplicated code for removing unreachable BBs.

[Peter Collingbourne]

Hi eugenis,

This moves removeUnreachableBlocksFromFn from SimplifyCFGPass.cpp
to Utils/Local.cpp and uses it to replace the implementation of
llvm::removeUnreachableBlocks, which appears to do a strict subset
of what removeUnreachableBlocksFromFn does.

http://llvm-reviews.chandlerc.com/D1334

Files:
  lib/Transforms/Scalar/SimplifyCFGPass.cpp
  lib/Transforms/Utils/Local.cpp
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