Unweaken vtables as per http://llvm.org/docs/CodingStandards.html#ll_virtual_anch

llvm-svn: 146959
diff --git a/clang/lib/Driver/Job.cpp b/clang/lib/Driver/Job.cpp
index 5443d70..825c86a 100644
--- a/clang/lib/Driver/Job.cpp
+++ b/clang/lib/Driver/Job.cpp
@@ -16,6 +16,8 @@
 
 Job::~Job() {}
 
+void Command::anchor() {}
+
 Command::Command(const Action &_Source, const Tool &_Creator,
                  const char *_Executable, const ArgStringList &_Arguments)
   : Job(CommandClass), Source(_Source), Creator(_Creator),