[lld] [lld] Merge equivalent symbols found during ICF (PR #134342)

[Fangrui Song via llvm-commits]

================
@@ -29,6 +29,13 @@ using namespace llvm::ELF;
 using namespace lld;
 using namespace lld::elf;
 
+void SymbolTable::redirect(Symbol *from, Symbol *to) {
+  int &fromIdx = symMap[CachedHashStringRef(from->getName())];
+  const int toIdx = symMap[CachedHashStringRef(to->getName())];
+
----------------
MaskRay wrote:

Nit: unneeded blank line


https://github.com/llvm/llvm-project/pull/134342