Implement periodt variant of instructions.

tests/PowerAnalyse/add-cond.cpp

@@ -0,0 +1,10 @@
+int add(int a, int b)
+{
+    int c = a + b;
+    return c == 0 ? 50000 : c;
+}
+
+extern "C" int _start()
+{
+    return add(1, 2);
+}