Add missing shader targets to dndxc (#2979)

When last updated, I left out the newer targets for vertex shaders.

Nothing about 6.6 is official yet, but it is an accepted option to dxc,
so we might as well add it now while we're at it.

tools/clang/tools/dotnetc/EditorForm.Designer.cs

@@ -630,39 +630,48 @@ namespace MainNs
             "ps_6_3",
             "ps_6_4",
             "ps_6_5",
+            "ps_6_6",
             "vs_6_0",
             "vs_6_1",
             "vs_6_2",
             "vs_6_3",
+            "vs_6_4",
+            "vs_6_5",
+            "vs_6_6",
             "cs_6_0",
             "cs_6_1",
             "cs_6_2",
             "cs_6_3",
             "cs_6_4",
             "cs_6_5",
+            "cs_6_6",
             "gs_6_0",
             "gs_6_1",
             "gs_6_2",
             "gs_6_3",
             "gs_6_4",
             "gs_6_5",
+            "gs_6_6",
             "hs_6_0",
             "hs_6_1",
             "hs_6_2",
             "hs_6_3",
             "hs_6_4",
             "hs_6_5",
+            "hs_6_6",
             "ds_6_0",
             "ds_6_1",
             "ds_6_2",
             "ds_6_3",
             "ds_6_4",
             "ds_6_5",
+            "ds_6_6",
             "lib_6_1",
             "lib_6_2",
             "lib_6_3",
             "lib_6_4",
-            "lib_6_5"});
+            "lib_6_5",
+            "lib_6_6"});
             this.cbProfile.Location = new System.Drawing.Point(4, 45);
             this.cbProfile.Margin = new System.Windows.Forms.Padding(2);
             this.cbProfile.Name = "cbProfile";