Document the new --enable-debug-runtime configure option.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24892 91177308-0d34-0410-b5e6-96231b3b80d8
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@@ -811,6 +811,11 @@
     unoptimized build (also known as a debug build).
     <p></p>
   </dd>
+  <dt><i>--enable-debug-runtime</i></dt>
+  <dd>
+    Enables debug symbols in the runtime libraries. The default is to strip
+    debug symbols from the runtime libraries. 
+  </dd>
   <dt><i>--enable-jit</i></dt>
   <dd>
     Compile the Just In Time (JIT) compiler functionality.  This is not