[lldb][API test] TestCortexMExceptionUnwind needs ARM llvm target Finally figured out the issue with TestCortexMExceptionUnwind.py failing on some CI. When the llvm is configured without the ARM target enabled, the ARM ABI plugins will not be initialized in lldb, and the unwind engine won't backtrace more than one stack frame. This test requires that the ARM target be enabled in the llvm cmake. Update the decorator to specify that; should be the end of these mysterious fails.
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