ELF2: SymbolBody::repl() never returns a nullptr.
ELF2: SymbolBody::repl() never returns a nullptr.

So we can use dyn_cast instead of dyn_cast_or_null here.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@251076 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld