Generate proper exception table

Don't forget to split nested try blocks without finally block
 on generating finally blocks from outer ones.

 #KT-31923 InProgress

compiler/testData/codegen/box/finally/kt31923_wrong.kt

@@ -0,0 +1,28 @@
+// !LANGUAGE: -ProperFinally
+// TARGET_BACKEND: JVM
+var result = ""
+
+fun test() {
+    try {
+        try {
+            result += "try"
+            return
+        } catch (fail: Throwable) {
+            result += " catch"
+        }
+    } finally {
+        result += " finally"
+        throw RuntimeException()
+    }
+}
+
+fun box(): String {
+    try {
+        test()
+        return "fail: expected exception"
+    } catch (e: RuntimeException) {
+
+    }
+
+    return if (result == "try finally catch finally") "OK" else "fail: $result"
+}