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When `fir.select_case` branches to blocks with arguments that have FIR types (e.g., `!fir.ref`), the block signature must be converted to LLVM types before creating the branch. Otherwise, the branch passes LLVM types (`!llvm.ptr`) but the block expects FIR types, causing a type mismatch error. This adds block signature conversion similar to what `SelectOpConversionBase` already does for `fir.select` and `fir.select_rank`.
Flang Integration Tests
This directory can be used to add Integration tests involving multiple stages of the compiler (for eg. from Fortran to LLVM IR). It should not contain executable tests. We should only add tests here sparingly and only if there is no other way to test. Repeat this message in each test that is added to this directory and sub-directories.