Revert "MC/MachO: Fix possible null pointer dereference."

This reverts commit 110575.

Target.isAbsolute() is true if SD would be null.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110683 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/MachObjectWriter.cpp

@@ -835,7 +835,7 @@ public:
       // FIXME: Currently, these are never generated (see code below). I cannot
       // find a case where they are actually emitted.
       Type = RIT_Vanilla;
-    } else if (SD) {
+    } else {
       // Check whether we need an external or internal relocation.
       if (doesSymbolRequireExternRelocation(SD)) {
         IsExtern = 1;