[lld] [wasm-ld] Refactor WasmSym from static globals to per-link context (PR #134970)

[Anutosh Bhat via llvm-commits]

anutosh491 wrote:

Hey @sbc100 ,

Thanks for the review already but I would like to point out that once you're satisfied with the changes, something that would really help me would be if you could add a milestone label (so that the changes are picked up by llvm 20.1.3)

Cause this ends up being a major blocker while running clang-repl in the browser (as one state affects the next state when we run cells one by one). Also should help me migrate xeus-cpp-lite to llvm 20 !

https://github.com/llvm/llvm-project/pull/134970