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Author SHA1 Message Date
Chris Lattner 30c3de6461 fix two problems with machine sinking: 
1. Sinking would crash when the first instruction of a block was
   sunk due to iterator problems.
2. Instructions could be sunk to their current block, causing an
   infinite loop.

This fixes PR3968

llvm-svn: 68787
 2009-04-10 16:38:36 +00:00