[MLIR] Fix FileCheck annotations and add 32-bit coverage (#167149) Addresses #93154 by ensuring the test RUN/FILECHECK prefixes across `mlir/test/Conversion/FuncToLLVM/` and related files match their expected outputs, and adds an `index-bitwidth=32` variant of `expand-then-convert-to-llvm.mlir` that exercises `@collapse_shape_dynamic_with_non_identity_layout` through the same MemRef-to-LLVM pipeline so the 32-bit layout descriptors are verified.
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