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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146960 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PTX/PTXSubtarget.cpp b/lib/Target/PTX/PTXSubtarget.cpp
index 1eb57d2..03cbb24 100644
--- a/lib/Target/PTX/PTXSubtarget.cpp
+++ b/lib/Target/PTX/PTXSubtarget.cpp
@@ -22,6 +22,8 @@
 
 using namespace llvm;
 
+void PTXSubtarget::anchor() { }
+
 PTXSubtarget::PTXSubtarget(const std::string &TT, const std::string &CPU,
                            const std::string &FS, bool is64Bit)
   : PTXGenSubtargetInfo(TT, CPU, FS),