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calls. The pass visits all external functions in the module and determines if such function calls can be optimized. The optimizations are specific to the library calls involved. This initial version only optimizes calls to exit(3) when they occur in main(): it changes them to ret instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21522 91177308-0d34-0410-b5e6-96231b3b80d8
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