[lld-macho] Qualify Reloc with macho namespace (NFC) (#141692)

With an upcoming change to llvm/ProfileData headers, this file ends up
with both llvm::Reloc in scope as well as the lld::macho::Reloc type
intended for use here. Qualify the use in this file with the intended
namespace to avoid compilation errors.

Author: teresajohnson

lld/MachO/BPSectionOrderer.cpp

@@ -84,7 +84,7 @@ struct BPOrdererMachO : lld::BPOrderer<BPOrdererMachO> {
 
 private:
   static uint64_t
-  getRelocHash(const Reloc &reloc,
+  getRelocHash(const macho::Reloc &reloc,
                const llvm::DenseMap<const void *, uint64_t> &sectionToIdx) {
     auto *isec = reloc.getReferentInputSection();
     std::optional<uint64_t> sectionIdx;