new test - traditional token paste

From-SVN: r33732

gcc/testsuite/gcc.dg/cpp-tradpaste.c

+/* Test for proper comment elimination semantics from cpplib's -traditional.
+   This should compile and link with compiled with `gcc -traditional-cpp'.
+   Test case by Jason R. Thorpe <thorpej@zembu.com>.  */
+
+/* { dg-do compile } */
+/* { dg-options "-traditional" } */
+
+#define A(name) X/**/name
+
+#define B(name) \
+void A(Y/**/name)() { A(name)(); }
+
+void Xhello() { printf("hello world\n"); }
+
+B(hello)
+
+int main() { XYhello(); return (0); }