[clang] [llvm] [mlir] [polly] [IRBuilder] Use SetInsertPoint without redundant BasicBlock argument (PR #228476)

[Nikita Popov via cfe-commits]

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nikic wrote:

I think we'll want to keep the method. It's widely used (grep gives more than 600 hits), and I don't think replacing it with `GetInsertPoint().getNodeParent()` would improve things.

As for the `BB` member, yes, we should drop it, but there is some preparatory work to do first.

https://github.com/llvm/llvm-project/pull/228476