Control flow side-effects for user-defined functions.

test/libyul/controlFlowSideEffects/simple_conditionals.yul

@@ -0,0 +1,34 @@
+{
+    function a() {
+        if calldataload(0) { g() }
+    }
+    function b() {
+        g()
+        if calldataload(0) { }
+    }
+    function c() {
+        if calldataload(0) { }
+        g()
+    }
+    function d() {
+        stop()
+        if calldataload(0) { g() }
+    }
+    function e() {
+        if calldataload(0) { g() }
+        stop()
+    }
+    function f() {
+        g()
+        if calldataload(0) { g() }
+    }
+    function g() { revert(0, 0) }
+}
+// ----
+// a: can revert, can continue
+// b: can revert
+// c: can revert
+// d: can terminate
+// e: can terminate, can revert
+// f: can revert
+// g: can revert

test/libyul/controlFlowSideEffects/simple_functions.yul

@@ -0,0 +1,17 @@
+{
+    function a() {}
+    function f() { g() }
+    function g() { revert(0, 0) }
+    function h() { stop() }
+    function i() { h() }
+    function j() { h() g() }
+    function k() { g() h() }
+}
+// ----
+// a: can continue
+// f: can revert
+// g: can revert
+// h: can terminate
+// i: can terminate
+// j: can terminate
+// k: can revert