[MLIR][IRDL][CMake] CMake fixes for cross-compilation#145672

Moxinilian merged 1 commit intollvm:mainllvm/llvm-project:mainfrom

arthurqiu:aq/fix_irtdtocpp_cross_compilearthurqiu/llvm-project:aq/fix_irtdtocpp_cross_compileCopy head branch name to clipboard