[flang-commits] [flang] [flang][codegen] Update FIR codegen to use mlir.llvm opaque pointers (PR #69692)

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jeanPerier wrote:

I rebased to incorporate https://github.com/llvm/llvm-project/pull/69772 (thanks @kiranchandramohan) and fix the conflicts.
The PR is now ready to be merged provided approval from the flang community.

https://github.com/llvm/llvm-project/pull/69692