[clang][test] Require x86 target for new Windows EH tests Added by https://github.com/llvm/llvm-project/pull/144745. These tests cause Clang -cc1 to generate the option -x86-asm-syntax=intel, which is only available if you have included the x86 target. <<<<<< 1: clang: warning: argument unused during compilation: '-c' [-Wunused-command-line-argument] label:38'0 X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found label:38'1 ? possible intended match 2: clang (LLVM option parsing): Unknown command line argument '-x86-asm-syntax=intel'. Try: 'clang (LLVM option parsing) --help' label:38'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3: clang (LLVM option parsing): Did you mean '--asan-stack=intel'? label:38'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >>>>>>
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