[lld] [ELF] Rename LazyObject to LazySymbol. NFC (PR #78809)

[Sam Clegg via llvm-commits]

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@@ -146,7 +146,7 @@ static uint64_t getSymVA(const Symbol &sym, int64_t addend) {
   case Symbol::SharedKind:
   case Symbol::UndefinedKind:
     return 0;
-  case Symbol::LazyObjectKind:
+  case Symbol::LazySymbolKind:
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sbc100 wrote:

I think this can also just be `LazyKind` since its matches the other kinds.

https://github.com/llvm/llvm-project/pull/78809