New test case for the preprocessor.

I made it up myself; the inspiration came from a comp.std.c post. -zack

From-SVN: r24767

gcc/testsuite/gcc.c-torture/execute/990119-1.c

+/* This checks for two things:
+   - an obscure corner case in the standard rules for __LINE__
+   - regression of an associated bug in cpplib where the semicolon got lost */
+int i = __LINE__\
+;
+
+int main (void)
+{
+  if (i != 4)
+    abort();
+  else
+    return 0;
+}