Support 'break' and 'continue' in expressions

- generate fake jump instructions so that we can always analyze stack depths
- fix stack before break and continue by dropping excessive elements (e.g., *a*.foo(*b*, c?:continue))
- Analyzer rewritten in Kotlin, with more flexible control of CFG traversal

 #Fixed KT-3340
 #Fixed KT-4258
 #Fixed KT-7941

compiler/testData/codegen/box/controlStructures/breakContinueInExpressions/tryFinally2.kt

@@ -0,0 +1,13 @@
+fun box(): String {
+    var r = ""
+    for (i in 1..1)  {
+        try {
+            r += "O"
+            break
+        } finally {
+            r += "K"
+            continue
+        }
+    }
+    return r
+}