问题
To provide TLS support to orcjit, I'm like to transforom llvm::Modules without TLS emulation to ones that emulateTLS and depend on a Runtime.
Similar functionality is already implemented in TargetLowering::LowerToTLSEmulatedModel, however it does not operate on IR.
So, how can i implement and perform this operation as an llvm::Pass ?
来源：https://stackoverflow.com/questions/42163796/how-to-perform-targetlowering-in-a-ir-trasformation-pass