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a4be1dc0a1
* Do not lead dangling dead constants prevent optimization * Iterate global optimization while we're making progress. These changes allow us to be more aggressive, handling cases like GlobalOpt/iterate.llx without a problem (turning it into 'ret int 0'). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16857 91177308-0d34-0410-b5e6-96231b3b80d8