Update C++ status pages for Clang 4 branch:

 * Update version number in DR tests from 4.0 to 4
 * Teach make_cxx_dr_status script about version numbers that don't contain a
   period.
 * Update cxx_status.html and cxx_dr_status.html to list Clang 4 features as
   "Clang 4" rather than "SVN"

Clang 4 features are still listed in yellow rather than green until release.

llvm-svn: 291871
diff --git a/clang/www/cxx_status.html b/clang/www/cxx_status.html
index 675cc6f..eb0beeb 100644
--- a/clang/www/cxx_status.html
+++ b/clang/www/cxx_status.html
@@ -612,7 +612,7 @@
     <tr>
       <td>Make exception specifications part of the type system</td>
       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0012r1.html">P0012R1</a></td>
-      <td class="svn" align="center">SVN</td>
+      <td class="svn" align="center">Clang 4</td>
     </tr>
     <tr>
       <td><tt>__has_include</tt> in preprocessor conditionals</td>
@@ -679,7 +679,7 @@
     <tr>
       <td>Dynamic memory allocation for over-aligned data</td>
       <td><a href="http://wg21.link/p0035r4">P0035R4</a></td>
-      <td class="svn" align="center">SVN</td>
+      <td class="svn" align="center">Clang 4</td>
     </tr>
     <tr>
       <td>Template argument deduction for class templates</td>
@@ -689,17 +689,17 @@
     <tr>
       <td>Non-type template parameters with <tt>auto</tt> type</td>
       <td><a href="http://wg21.link/p0127r2">P0127R2</a></td>
-      <td class="svn" align="center">SVN</td>
+      <td class="svn" align="center">Clang 4</td>
     </tr>
     <tr>
       <td>Guaranteed copy elision</td>
       <td><a href="http://wg21.link/p0135r1">P0135R1</a></td>
-      <td class="svn" align="center">SVN</td>
+      <td class="svn" align="center">Clang 4</td>
     </tr>
     <tr>
       <td rowspan=2>Stricter expression evaluation order</td>
       <td><a href="http://wg21.link/p0145r3">P0145R3</a></td>
-      <td class="svn" align="center" rowspan=2>SVN <a href="#p0145">(10)</a></td>
+      <td class="svn" align="center" rowspan=2>Clang 4 <a href="#p0145">(10)</a></td>
     </tr>
     <tr>
       <td><a href="http://wg21.link/p0400r0">P0400R0</a></td>
@@ -722,7 +722,7 @@
     <tr>
       <td>Structured bindings</td>
       <td><a href="http://wg21.link/p0217r3">P0217R3</a></td>
-      <td class="svn" align="center">SVN</td>
+      <td class="svn" align="center">Clang 4</td>
     </tr>
     <tr>
       <td>Separate variable and condition for <tt>if</tt> and <tt>switch</tt></td>
@@ -738,12 +738,12 @@
     <tr>
       <td>Removing deprecated dynamic exception specifications</td>
       <td><a href="http://wg21.link/p0003r5">P0003R5</a></td>
-      <td class="svn" align="center">SVN</td>
+      <td class="svn" align="center">Clang 4</td>
     </tr>
     <tr>
       <td>Pack expansions in <em>using-declarations</em></td>
       <td><a href="http://wg21.link/p0195r2">P0195R2</a></td>
-      <td class="svn" align="center">SVN</td>
+      <td class="svn" align="center">Clang 4</td>
     </tr>
 </table>
 
@@ -765,10 +765,10 @@
 </span><br>
 <span id="p0522">(12): Despite being the the resolution to a Defect Report, this
 feature is disabled by default in all language versions, and can be enabled
-explicitly with the flag <tt>-frelaxed-template-template-args</tt>. The change
-to the standard lacks a corresponding change for template partial ordering,
-resulting in ambiguity errors for reasonable and previously-valid code. This
-issue is expected to be rectified soon.
+explicitly with the flag <tt>-frelaxed-template-template-args</tt> in Clang 4.
+The change to the standard lacks a corresponding change for template partial
+ordering, resulting in ambiguity errors for reasonable and previously-valid
+code. This issue is expected to be rectified soon.
 </span>
 </p>
 </details>
@@ -802,8 +802,8 @@
       </td>
     </tr>
     <tr>
-      <td class="svn" align="center">
-        SVN (<a href="http://wg21.link/p0096r3">P0096R3</a>)</a>
+      <td class="full" align="center">
+        Clang 4 (<a href="http://wg21.link/p0096r3">P0096R3</a>)</a>
       </td>
     </tr>
     <!-- FIXME: Implement latest recommendations.