Add a decorator to skip tests when running under Rosetta

[aprantl]

Summary

This allows skipping a test when running the testsuite on macOS under the Rosetta translation layer.

[davide]

Good, one minor suggestion.

lldb/packages/Python/lldbsuite/test/decorators.py

560

There might be a more direct way of checking this, maybe machine(). We used platform().uname() for internal limitations & machine not always returning the right string, but it should be fixed on Beta 1 (and beyond) for sure

lldb/packages/Python/lldbsuite/test/decorators.py

def are_sb_headers_missing():
             "LLDB.h")
         if not os.path.exists(header):
             return "skip because LLDB.h header not found"
         return None
 
     return skipTestIfFn(are_sb_headers_missing)(func)
 
 
+def skipIfRosetta(func, bugnumber=None):
+    """Skip a test when running the testsuite on macOS under the Rosetta translation layer."""
+    def is_running_rosetta(self):
+        if not lldbplatformutil.getPlatform() in ['darwin', 'macosx']:
+            return False
+        return platform.uname()[5] == "arm" and self.getArchitecture() == "x86_64"
+    return skipTestIfFn(is_running_rosetta, bugnumber)(func)
+
 def skipIfiOSSimulator(func):
     """Decorate the item to skip tests that should be skipped on the iOS Simulator."""
     def is_ios_simulator():
         return "skip on the iOS Simulator" if configuration.lldb_platform_name == 'ios-simulator' else None
     return skipTestIfFn(is_ios_simulator)(func)
 
 def skipIfiOS(func):
     return skipIfPlatform(["ios"])(func)