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

[Ramkumar Ramachandra via cfe-commits]

================

----------------
artagnon wrote:

Okay, I was just worried about correctness issues from setting the insert-point to a different BB, but if this is not an issue, maybe just add a TODO or FIXME for this method and the BB member for future contributors?

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