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* Drop references to globals who do exist in the globals graph, but are neverChris Lattner2003-06-281-1/+16
| | | | | | | | read or written to. Keep track of how many times this happens. This should be good for deleting things like references to type information in C++ classes git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6946 91177308-0d34-0410-b5e6-96231b3b80d8
* New pass to perform DSA based optimizations. Initially we just support turningChris Lattner2003-06-281-0/+76
globals into constants if we can prove it's safe git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6941 91177308-0d34-0410-b5e6-96231b3b80d8