Put the implicit weak sized deallocation funciton in C++14 in a comdat

Fixes PR22635.

llvm-svn: 229913

clang/lib/CodeGen/CodeGenFunction.cpp

@@ -806,6 +806,8 @@ static void EmitSizedDeallocationFunction(CodeGenFunction &CGF,
                                           const FunctionDecl *UnsizedDealloc) {
   // This is a weak discardable definition of the sized deallocation function.
   CGF.CurFn->setLinkage(llvm::Function::LinkOnceAnyLinkage);
+  CGF.CurFn->setComdat(
+      CGF.CGM.getModule().getOrInsertComdat(CGF.CurFn->getName()));
 
   // Call the unsized deallocation function and forward the first argument
   // unchanged.