Test for optimizer bug with -finline-functions.

Reported by Jim Meyering; distilled from bash.

From-SVN: r30517

gcc/testsuite/gcc.c-torture/execute/991112-1.c

+/* This code was miscompiled at -O3 on x86.
+   Reported by Jim Myering; distilled from bash.  */
+
+int rl_show_char (int c) { return 0; }
+
+int rl_character_len (int c, int pos)
+{
+  return isprint (c) ? 1 : 2;
+}
+
+int main(void)
+{
+  int (*x)(int, int) = rl_character_len;
+  if (x('a', 1) != 1)
+    abort();
+  if (x('\002', 1) != 2)
+    abort();
+  return 0;
+}