Chandler Carruth f3e8502cc1 Add 'llvm_unreachable' to passify GCC's understanding of the constraints ...

of several newly un-defaulted switches. This also helps optimizers
(including LLVM's) recognize that every case is covered, and we should
assume as much.

llvm-svn: 147861

2012-01-10 18:08:01 +00:00

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