Add additional test coverage for C2x N2508

This spotted a mistake with the original patch, so it puts the status
back to "partial" in the C status tracking page.

This amends 5103836.

clang/test/C/C2x/n2508.c

@@ -0,0 +1,22 @@
+// RUN: %clang_cc1 -verify -std=c2x %s
+
+/* WG14 N2508: partial
+ * Free positioning of labels inside compound statements
+ */
+void test() {
+  {
+  inner:
+  }
+
+  switch (1) {
+  // FIXME: this should be accepted per C2x 6.8.2p2.
+  case 1: // expected-error {{label at end of switch compound statement: expected statement}}
+  }
+
+  {
+  multiple: labels: on: a: line:
+  }
+
+final:
+}
+

clang/www/c_status.html

@@ -763,7 +763,13 @@ <h2 id="c2x">C2x implementation status</h2>
     <tr>
       <td>Free positioning of labels inside compound statements</td>
       <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2508.pdf">N2508</a></td>
-      <td class="unreleased" align="center">Clang 16</td>
+        <td class="partial" align="center">
+          <details><summary>Partial</summary>
+            Clang supports labels at the end of compound statements but does
+            not yet support <code>case</code> or <code>default</code> labels at
+            the end of a switch statement's compound block.
+          </details>
+        </td>
     </tr>
     <tr>
       <td>Clarification request for C17 example of undefined behavior</td>