[llvm-commits] updated nounwind for basic blocks patch

[Nick Lewycky]

This patch adds nounwind to basic blocks.

The major change from the previous patch is the removal of any attempt 
at tri-state behaviour between nounwind and unwinds to. We now permit 
basic blocks to be defined with both:

   bb42: nounwind unwinds to %cleanup42

the reason being that a block may be marked 'nounwind' by a pass that 
needs to preserve the CFG and therefore can't remove the 'unwinds to' edge.

Nick
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