Create a SymbolBody for locals.

pr26878 shows a case where locals have to be in the got.

llvm-svn: 263222
diff --git a/lld/ELF/Symbols.cpp b/lld/ELF/Symbols.cpp
index d32bbb0..b780a99 100644
--- a/lld/ELF/Symbols.cpp
+++ b/lld/ELF/Symbols.cpp
@@ -68,6 +68,8 @@
     return 0;
   case DefinedBitcodeKind:
     llvm_unreachable("Should have been replaced");
+  case DefinedLocalKind:
+    llvm_unreachable("Should not be used");
   }
   llvm_unreachable("Invalid symbol kind");
 }