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985410f87f
This PR hides the reference-counted pointer that holds `TargetOptions` from the public API of `CompilerInvocation`. This gives `CompilerInvocation` an exclusive control over the lifetime of this member, which will eventually be leveraged to implement a copy-on-write behavior. There are two clients that currently share ownership of that pointer: * `TargetInfo` - This was refactored to hold a non-owning reference to `TargetOptions`. The options object is typically owned by the `CompilerInvocation` or by the new `CompilerInstance::AuxTargetOpts` for the auxiliary target. This needed a bit of care in `ASTUnit::Parse()` to keep the `CompilerInvocation` alive. * `clangd::PreambleData` - This was refactored to exclusively own the `TargetOptions` that get moved out of the `CompilerInvocation`.