[llvm-dev] Replace "ret" with "pop+jump"

[PenYiWang via llvm-dev]

Hi

I want to replace all the return instructions in the program with pop
<reg>; jmp <reg>.

Should I use  IRBuilder in LLVM IR level?

I found that there is a IRBuilder::CreateIndirectBr

Or Should I modify the code in lib/Target/X86/X86ISelLowering.cpp in
backend ?

I found that there is a X86TargetLowering::LowerCall

Which is better?

Thanks
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