[PATCH] Switch to Select optimisations - Two Case switch to select

[Marcello Maggioni]

Hi hans,

This optimization is derived from the optimisations in http://reviews.llvm.org/D5525

The optimisations in D5525 are of three kind. This patch contains only one kind (the Convert Two case switch to select), for review.

Checkout D5525 initial comment for a full description of all the optimisations.

http://reviews.llvm.org/D5620

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