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/nestedFinallyAndNonFinallyTry.kt

@@ -0,0 +1,32 @@
+// !LANGUAGE: +ProperFinally
+var result = ""
+
+fun test() {
+    try {
+        try {
+            try {
+                result += "try"
+                return
+            } catch (fail: Throwable) {
+                result += " catch"
+            }
+        } finally {
+            result += " finally 1"
+            throw RuntimeException("Fail 1")
+        }
+    } finally {
+        result += " finally 2"
+        throw RuntimeException("Fail 2")
+    }
+}
+
+fun box(): String {
+    try {
+        test()
+        return "fail: expected exception"
+    } catch (e: RuntimeException) {
+        if (e.message != "Fail 2") return "wrong exception: ${e.message}"
+    }
+
+    return if (result == "try finally 1 finally 2") "OK" else "fail: $result"
+}