Xi Ge e1aaee4fec Frontend: add a frontend flag to generate empty ABI descriptors to workaround deserialization issues ...

ABI descriptors should always be emitted as sidecars for library-evolution-enabled modules.
However, generating these files requires traversing the entire module (like indexing), which may
hit additional deserialization issues. To unblock builds, this patch introduces a flag to skip
the traversing logic so that we emit an empty ABI descriptor file. The empty file serves as
a placeholder so that build system doesn't need to know the details.

2022-02-23 23:18:20 -08:00

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