[flang] Fail fir.global conversion when the type has no LLVM equivalent (#232610) `GlobalOpConversion` passed the result of `convertType` straight to `LLVM::GlobalOp::create`. For a global whose type the FIR type converter cannot lower, such as tensor<10xi32>, that result is null and TypeAttr::get segfaults. Return a match failure instead so the conversion reports that `fir.global` could not be legalized. Assisted-by: Claude code Signed-off-by: Keshav Vinayak Jha <keshavvinayakjha@gmail.com>
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