Use strip_bitcode for create_arm_gen_snapshot (#36510)
Use strip_bitcode for create_arm_gen_snapshot (#36510)

This migrates the `create_arm_gen_snapshot` target used to create a
copy of gen_snapshot suffixed with its target CPU architecture using the
same `strip_bitcode` macro used for the equivalent target used for
desktop gen_snapshot.

In a followup patch, these will be merged to a single target. They
currently still have incompatible output paths.

Issue: https://github.com/flutter/flutter/issues/103386
Issue: https://github.com/flutter/flutter/issues/101138
Issue: https://github.com/flutter/flutter/issues/107884
flutter/engine,flutter/engine,flutter/engine,flutter/engine,flutter/engine,flutter/engine,flutter/engine,flutter/engine