[llvm] IR2Builder tool for converting LLVM IR files into C++ IRBuilder API (PR #117129)

[Marek Sedláček via llvm-commits]

mark-sed wrote:

> > ConstantExpr creation.
> 
> You can create ConstantExprs using the usual IRBuilder APIs for instructions. IRBuilder will automatically convert to ConstExpr where possible.

@nikic is your idea to replace all the ConstantExprs with call to `getAsInstruction()`?

https://github.com/llvm/llvm-project/pull/117129