Kuba (Brecka) Mracek e405a9fae8 Extend LLVM IR WME to use thunks for cross-module witness method calls. (#39528) ...

This enables optimizing / dead-stripping of witness methods across modules at
LTO time.

- Under -internalize-at-link, restrict visibility of wtables to linkage unit.
- Emit thunks for cross-module wcalls when WME is enabled.
- Use thunks for wcalls across modules when WME is enabled.
- Adjust TBDGen to account for witness method thunks when WME is enabled.
- Add an IR test to check that thunks are used when doing cross-module calls.
- Add an end-to-end test case for cross-module WME.

2021-10-01 07:09:50 -07:00

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