[lld] [LLD][AArch64] Mark .plt with PURECODE flag if all input sections also have it (PR #132224)

[Peter Smith via llvm-commits]

https://github.com/smithp35 commented:

I've made a suggestion that I think will work for non-degenerate cases that avoids the loop.

https://github.com/llvm/llvm-project/pull/132224