[MLIR][IRDL][CMake] Switch to using `setup_host_tool` to fix cross compilation (#156606) Using `build_native_tool` directly doesn't seem to be standard, instead other tools seem to call `setup_host_tool` (e.g. milr-linalg-ods-gen and `add_tablegen` seems to have a copy of `setup_host_tool` internally). When cross compiling llvm in two stages, the first building all native tools and then the second using those built tools to cross compile, this prevents the second stage from trying to rebuild mlir-irdl-to-cpp, which fails.
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