Use side-effects of user defined functions in evm code transform.

test/libyul/evmCodeTransform/after_terminating_function.yul

@@ -0,0 +1,22 @@
+{
+	let b := f(1, 2)
+	function f(a, r) -> t { revert(0, 0) }
+	b := f(3, 4)
+}
+// ====
+// stackOptimization: true
+// ----
+//     /* "":17:18   */
+//   0x02
+//     /* "":14:15   */
+//   0x01
+//     /* "":12:19   */
+//   tag_1
+//   jump	// in
+//     /* "":21:59   */
+// tag_1:
+//     /* "":55:56   */
+//   0x00
+//     /* "":45:57   */
+//   dup1
+//   revert