Kuba (Brecka) Mracek 9fb54e95ae Add -internalize-at-link flag to allow dead stripping and VFE across modules at link time (#39214) ...

- Under -internalize-at-link, stop unconditionally marking all globals as used.
- Under -internalize-at-link, restrict visibility of vtables to linkage unit.
- Emit virtual method thunks for cross-module vcalls when VFE is enabled.
- Use thunks for vcalls across modules when VFE is enabled.
- Adjust TBDGen to account for virtual method thunks when VFE is enabled.
- Add an end-to-end test case for cross-module VFE.

2021-09-21 12:26:52 -07:00

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