[OpenMP][OMPIRBuilder] Support complex types in atomic update/capture (#191490) Route struct-typed values through the libcall path in `emitAtomicUpdate`. Previously, the libcall path was gated on `RMWOp == BAD_BINOP`, so atomic capture swap patterns (`v = x; x = expr`) for complex values lowered as structs fell through to the cmpxchg path. That path called `getScalarSizeInBits()` on a struct type, produced 0, and triggered an assertion in `IntegerType::get()`. Remove the `BAD_BINOP` restriction so struct types always use the libcall path. This is safe because the libcall path does not use `RMWOp` and already handles arbitrary type sizes correctly. Also fix `LoadSize` in the libcall path to use `XElemTy` rather than the pointer type, which previously gave the wrong size for larger complex types such as `complex(8)`. Fixes https://github.com/llvm/llvm-project/issues/191317 Assisted with copilot and GPT-5.4
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