Paul Kirth 55c7d5cdad [llvm][EmbedBitcodePass] Prevent modifying the module with ThinLTO (#139999) ...

Since ThinLTOBitcodeWriterPass handles many things for CFI and WPD, like
updating vtable linkage, we need to prevent those changes from
persisting in the non-LTO object code we will compile under FatLTO.

The only non-invasive way to do that is to clone the module when
serializing the module in ThinLTOBitcodeWriterPass. We may be able to
avoid cloning in the future with additional infrastructure to restore
the IR to its original state.

Fixes #139440

2025-05-29 13:42:48 -07:00

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