[PATCH] SimplifyCFG: don't remove unreachable defaults from switch instructions; exploit them instead!

[Hans Wennborg]

I committed the tests that were checking existing functionality in r223395 and r223396 to reduce the size of this patch a little.

http://reviews.llvm.org/D6471

Files:
  lib/Transforms/Utils/Local.cpp
  lib/Transforms/Utils/SimplifyCFG.cpp
  test/Transforms/SimplifyCFG/UnreachableEliminate.ll
  test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll
  test/Transforms/SimplifyCFG/switch-range-to-icmp.ll
  test/Transforms/SimplifyCFG/switch-to-select-two-case.ll
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