[lld] [ELF] ScriptLexer: generate tokens lazily (PR #100493)

[Fangrui Song via llvm-commits]

MaskRay wrote:

> Do you think it would be possible to split this patch into several more atomic changes?

I'd love to make smaller changes, but I don't find a way to do so. The bullet points describe why these functions are so intertwined that make smaller changes infeasible...

https://github.com/llvm/llvm-project/pull/100493