[Flang][OpenMP] Preserve MapInfoOp loc on descriptor base-address maps (#196086) This PR tries to fix another issue which was discovered after https://github.com/llvm/llvm-project/issues/195333 was fixed. Now when we run the same steps, we see the following output ``` omptarget device 0 info: Entering OpenMP data region with being_mapper at test.f90:18:9 with 5 arguments: omptarget device 0 info: alloc(ptr(1:1024))[48] omptarget device 0 info: to(ptr(1:1024))[0] omptarget device 0 info: to(ptr(1:1024))[40] omptarget device 0 info: to(unknown)[8] omptarget device 0 info: to(unknown)[4096] ``` Notice "unknown" in the last 2 lines. This happens because `MapInfoFinalization` splits box descriptor `omp.map.info` ops into a parent map and a base-address member map (fir.box_offset + inner map with var_ptr_ptr). The `genBaseAddrMap` used `descriptor.getLoc()` for those new ops, which dropped the `NameLoc` that lowering attaches for the Fortran map text. OpenMP-LLVM derives offload map names from that location, so the member map showed up as "unknown" while the parent still had the correct name. To fix this, we now pass the expanded `MapInfoOp's` location (op->getLoc()) into `genBaseAddrMap` and use it for fir.box_offset and the inner `omp.map.info` so `NameLoc` is preserved.
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