proper try/catch/finally

compiler/testData/codegen/regressions/kt496.jet

@@ -0,0 +1,52 @@
+fun test1() : Boolean {
+    try {
+        return true
+    } finally {
+          if(true) // otherwise we wisely have unreachable code
+            return false
+    }
+}
+
+var x = true
+fun test2() : Boolean {
+    try {
+    } finally {
+        x = false;
+    }
+    return x
+}
+
+fun test3() : Int {
+    var y = 0
+    try {
+        ++y
+    } finally {
+        ++y
+    }
+    return y
+}
+
+var z = 0
+fun test4() : Int {
+    z = 0
+    return try {
+        try {
+            z++
+        }
+        finally {
+            z++
+        }
+    } finally {
+        ++z
+    }
+}
+
+fun box() : String {
+    if(test1()) return "test1 failed"
+    if(test2()) return "test2 failed"
+    if(test3() != 2) return "test3 failed"
+    System.out?.println(test4())
+    if(test4() != 3) return "test4 failed"
+
+    return "OK"
+}