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Clients may call writeMergedModules before calling optimize, or call compileOptimized without calling optimize. Make sure they don't sneak past the verifier. This adds LTOCodeGenerator::verifyMergedModuleOnce, and calls it from writeMergedModule, optimize, and codegenOptimized. I couldn't find a good way to test this. I tried writing broken IR to send into llvm-lto, but LTOCodeGenerator doesn't understand textual IR, and assembler runs the verifier itself anyway. Checking in valid-but-doesn't-verify bitcode here doesn't seem valuable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266894 91177308-0d34-0410-b5e6-96231b3b80d8
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