[lld] [lld][ELF] Use the containing symbol, not the referenced symbol, for undefined symbol errors. (PR #70800)

[Peter Smith via llvm-commits]

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@@ -693,6 +693,34 @@ static const Symbol *getAlternativeSpelling(const Undefined &sym,
   return nullptr;
 }
 
+static Symbol &
+getSymAtOffset(InputSectionBase &sec, uint64_t off, Symbol &sym) {
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smithp35 wrote:

Would getSymContainingOffset() be a better name, as we're looking for the symbol with off in the range [sym->off,, sym->off + sym->size) .  

https://github.com/llvm/llvm-project/pull/70800