[LLVMbugs] [PATCH] CEE for switch instructions

[Eric Kidd]

Here's a small patch which allows the CEE optimizer to propagate the  
condition value down each non-default branch of a switch statement.

Since (a) the CEE optimizer is unsupported, and (b) I don't actually  
understand how it works anyway, you shouldn't use this patch on  
production code (unless your grasp of what's going on is better than  
mine!).

This patch includes a test case, and it doesn't cause any new test  
failures on my machine. If the LLVM maintainers would like to use  
this patch, I place it into the public domain.

Share and enjoy!

Cheers,
Eric

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