Relocate with the symbol if the relocation is of kind NTPOFF.
Patch by David Meyer, I added the test.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120104 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/ELFObjectWriter.cpp b/lib/MC/ELFObjectWriter.cpp
index 82bfe29..7c322f3 100644
--- a/lib/MC/ELFObjectWriter.cpp
+++ b/lib/MC/ELFObjectWriter.cpp
@@ -729,7 +729,8 @@
   if (&Sec2 != &Section &&
       (Kind == MCSymbolRefExpr::VK_PLT ||
        Kind == MCSymbolRefExpr::VK_GOTPCREL ||
-       Kind == MCSymbolRefExpr::VK_GOTOFF)) {
+       Kind == MCSymbolRefExpr::VK_GOTOFF ||
+       Kind == MCSymbolRefExpr::VK_NTPOFF)) {
     if (Renamed)
       return Renamed;
     return &Symbol;