[PATCH] SelectionDAG switch lowering: Replace unreachable default with most popular case.

[Hans Wennborg]

Addressing David's comments.

http://reviews.llvm.org/D6510

Files:
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  test/CodeGen/X86/2013-10-14-FastISel-incorrect-vreg.ll
  test/CodeGen/X86/asm-label.ll
  test/CodeGen/X86/switch-jump-table.ll
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