[lld][ELF] Merge equivalent symbols found during ICF#139493

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pranavk wants to merge 8 commits intollvm:mainfrom

pranavk:addends

Commits on May 13, 2025

Commits on May 14, 2025

[lld][ELF] Prevent merging two sections when they point to non-globals
pranavk
committed

Commits on May 20, 2025

Add tests for to prevent local-global merging
pranavk
committed

Commits on May 23, 2025

Address some of Fangrui's review comments
pranavk
committed

Commits on Jun 2, 2025