Add a decorator to skip tests when running under Rosetta

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

Differential Revision: https://reviews.llvm.org/D83600

Author: adrian-prantl

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

@@ -552,6 +552,14 @@ def are_sb_headers_missing():
     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():