Added several flow control tests.

test/misc/flow-do-01.c

@@ -0,0 +1,87 @@
+int a;
+
+static int f1(void)
+{
+    do {
+        return a;
+    } while (a == 2);
+    /* Unreachable */
+    a = 2;
+    return a;
+}
+
+static int f2(void)
+{
+    do {
+        return a;
+    } while (1);
+    /* Unreachable */
+    a = 2;
+    return a;
+}
+
+static int f3(void)
+{
+    do {
+        return a;
+    } while (0);
+    /* Unreachable */
+    a = 2;
+    return a;
+}
+
+static int f4(void)
+{
+    do {
+        continue;       /* Turns do/while into an endless loop */
+    } while (0);
+    /* Unreachable */
+    a = 2;
+    return a;
+}
+
+static int f5(void)
+{
+    do {
+       	if (a == 2) {
+            break;
+        }
+        return a;
+    } while (0);
+    /* Reachable */
+    a = 2;
+    return a;
+}
+
+static int f6(void)
+{
+    do {
+       	if (a == 2) {
+            break;
+        }
+        continue;
+    } while (0);
+    /* Reachable */
+    a = 2;
+    return a;
+}
+
+static int f7(void)
+{
+    do {
+       	if (a == 2) {
+            return a;
+        } else {
+            continue;
+	}
+    } while (1);
+    /* Unreachable */
+    a = 2;
+    return a;
+}
+
+int main(void)
+{
+    return f1() + f2() + f3() + f4() + f5() + f6() + f7();
+}
+