[PowerPC] Add support for TLS data relocations

This adds support for TLS data relocations and modifiers:
       .quad target@dtpmod
       .quad target@tprel
       .quad target@dtprel
Currently exploited by the asm parser only.

llvm-svn: 185394
diff --git a/llvm/lib/MC/MCELFStreamer.cpp b/llvm/lib/MC/MCELFStreamer.cpp
index 687ddfc..a89e8a6 100644
--- a/llvm/lib/MC/MCELFStreamer.cpp
+++ b/llvm/lib/MC/MCELFStreamer.cpp
@@ -363,6 +363,7 @@
     case MCSymbolRefExpr::VK_Mips_GOTTPREL:
     case MCSymbolRefExpr::VK_Mips_TPREL_HI:
     case MCSymbolRefExpr::VK_Mips_TPREL_LO:
+    case MCSymbolRefExpr::VK_PPC_DTPMOD:
     case MCSymbolRefExpr::VK_PPC_TPREL:
     case MCSymbolRefExpr::VK_PPC_TPREL_LO:
     case MCSymbolRefExpr::VK_PPC_TPREL_HI: