tree e899545fbab9934f663643c00460d582f83819de
parent f358414df79ca7ee137c28ba332ef42856c1e381
author Dan Gohman <gohman@apple.com> 1281745782 +0000
committer Copybara-Service <copybara-worker@google.com> 1601119125 -0700

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
GitOrigin-RevId: 4a63fad976c8cf3bcdc1bbc3927668164890ecb8