Chandler Carruth a46e62424b Factor the logic for testing whether a basic block is viable for code
extraction into a public interface. Also clean it up and apply it more
consistently such that we check for landing pads *anywhere* in the
extracted code, not just in single-block extraction.

This will be used to guide decisions in passes that are planning to
eventually perform a round of code extraction.

llvm-svn: 156114
2012-05-03 22:26:53 +00:00
2012-05-03 20:52:22 +00:00
2012-04-30 23:49:05 +00:00
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