Add a testcase for https://github.com/cc65/cc65/pull/757

test/misc/goto.c

@@ -0,0 +1,65 @@
+#include <stdio.h>
+#define false 0
+#define true (!false)
+
+int main () {
+    int var  = 3;
+    int quit = false;
+
+    goto finish;
+
+    while (!quit) {
+        var += 1;
+        {
+            if (var % 2) {
+                int var2 = 2;
+                int var3 = 4;
+                goto safe;
+                goto unsafe;
+                {
+                another:
+                    var2 = 0x5599;
+                safe:
+                    printf ("var2: %d\n", var2);
+                }
+            } else {
+                int var3 = 3;
+                int x    = 4;
+                goto unsafe;
+                goto bad;
+            unused:
+                printf ("var3: %d\n", var3);
+                {
+                    int var = 1;
+                bad:
+                    var++;
+                    if (var < 4)
+                        goto bad;
+                    goto finish;
+                }
+            unsafe:
+                var3 = 4;
+                goto another;
+            }
+
+            {
+                int var = 2;
+                goto bad;
+            }
+
+
+            var += 1;
+            if (var >= 10)
+                goto finish;
+        }
+    }
+finish:
+    return var;
+}
+
+int function () {
+    goto end;
+
+end:
+    ;
+}