Duncan Sands 8f0f616a54 Fix issues (infinite loop and/or crash) with self-referential instructions, for
example degenerate phi nodes and binops that use themselves in unreachable code.
Thanks to Charles Davis for the testcase that uncovered this can of worms.

llvm-svn: 158508
2012-06-15 08:37:50 +00:00
..
2010-01-18 21:58:32 +00:00