Fix #1313: Variables names from PDB file not used.

ILSpy/Languages/CSharpLanguage.cs

@@ -110,6 +110,7 @@ namespace ICSharpCode.ILSpy
 		{
 			CSharpDecompiler decompiler = new CSharpDecompiler(module, module.GetAssemblyResolver(), options.DecompilerSettings);
 			decompiler.CancellationToken = options.CancellationToken;
+			decompiler.DebugInfoProvider = module.GetDebugInfoOrNull();
 			while (decompiler.AstTransforms.Count > transformCount)
 				decompiler.AstTransforms.RemoveAt(decompiler.AstTransforms.Count - 1);
 			return decompiler;