Implement .weakref.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117911 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCObjectStreamer.cpp b/lib/MC/MCObjectStreamer.cpp
index 8a481e8..3883f12 100644
--- a/lib/MC/MCObjectStreamer.cpp
+++ b/lib/MC/MCObjectStreamer.cpp
@@ -74,6 +74,11 @@
   return Value;
 }
 
+void MCObjectStreamer::EmitWeakReference(MCSymbol *Alias,
+                                         const MCSymbol *Symbol) {
+  report_fatal_error("This file format doesn't support weak aliases.");
+}
+
 void MCObjectStreamer::SwitchSection(const MCSection *Section) {
   assert(Section && "Cannot switch to a null section!");