new testcase: tblgen should grok this.

llvm-svn: 23247
diff --git a/llvm/test/Regression/TableGen/nested-comment.td b/llvm/test/Regression/TableGen/nested-comment.td
new file mode 100644
index 0000000..68e2958
--- /dev/null
+++ b/llvm/test/Regression/TableGen/nested-comment.td
@@ -0,0 +1,12 @@
+// RUN: tblgen < %s
+
+/* foo
+
+/ foo
+
+     /*NoReg*/, baz
+     
+      
+      */
+
+def X;