Mingming Liu 51a3bc1217 [ThinLTO]Clean up 'import-assume-unique-local' flag. (#102424) ...

While manual compiles can specify full file paths and build automation
tools use full, unique paths in practice, it's not clear whether it's a
general good practice to enforce full paths (fail a build if relative
paths are used).

`NumDefs == 1` condition [1] should hold true for many internal-linkage
vtables as long as full paths are indeed used to salvage the marginal
performance when local-linkage vtables are imported due to indirect
reference.
https://github.com/llvm/llvm-project/pull/100448#discussion_r1692068402
has more details.

[1]
https://github.com/llvm/llvm-project/pull/100448/files#diff-e7cb370fee46f0f773f2b5429dfab36b75126d3909ae98ee87ff3d0e3f75c6e9R215

2024-08-09 16:48:05 -07:00

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