Dan Gohman 4a63fad976 Teach SimplifyCFG how to simplify indirectbr instructions. ...

- Eliminate redundant successors.
 - Convert an indirectbr with one successor into a direct branch.

Also, generalize SimplifyCFG to be able to be run on a function entry block.
It knows quite a few simplifications which are applicable to the entry
block, and it only needs a few checks to avoid trouble with the entry block.

llvm-svn: 111060

2010-08-14 00:29:42 +00:00

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