Convert obj->getSymbolName to sym->getName.

I doesn't depend on the object anymore.

llvm-svn: 240996
diff --git a/llvm/tools/llvm-objdump/llvm-objdump.cpp b/llvm/tools/llvm-objdump/llvm-objdump.cpp
index 3330823..796a79e 100644
--- a/llvm/tools/llvm-objdump/llvm-objdump.cpp
+++ b/llvm/tools/llvm-objdump/llvm-objdump.cpp
@@ -359,7 +359,7 @@
       return EC;
     Target = *SecName;
   } else {
-    ErrorOr<StringRef> SymName = EF.getSymbolName(StrTab, symb);
+    ErrorOr<StringRef> SymName = symb->getName(StrTab);
     if (!SymName)
       return SymName.getError();
     Target = *SymName;