Define WeakRefDirective.

llvm-svn: 132098
diff --git a/llvm/lib/Target/Mips/MipsMCAsmInfo.cpp b/llvm/lib/Target/Mips/MipsMCAsmInfo.cpp
index fe48ab7..ca00463 100644
--- a/llvm/lib/Target/Mips/MipsMCAsmInfo.cpp
+++ b/llvm/lib/Target/Mips/MipsMCAsmInfo.cpp
@@ -24,4 +24,5 @@
   ZeroDirective               = "\t.space\t";
   GPRel32Directive            = "\t.gpword\t";
   HasSetDirective             = false;
+  WeakRefDirective            = "\t.weak\t";
 }