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StructType::setBody is the only mechanism that can potentially create recursion in the type system. Add a runtime check that it is not actually used to create recursion. If the check fails, report an error from LLParser, BitcodeReader and IRLinker. In all other cases assert that the check succeeds. In future StructType::setBody will be removed in favor of specifying the body when the type is created, so any performance hit from this runtime check will be temporary.
This directory contains testcases that the verifier is supposed to detect as malformed LLVM code. Testcases for situations that the verifier incorrectly identifies as malformed should go in the test/Assembler directory.