Properly process nested try and loop blocks

KT-3894: Loops and finally: finally block executed twice when break and return exists in try/finally block
KT-3874: Compilation error on try catch block contains break and continue
KT-3869: Loops and finally: outer finally block not run

 #KT-3869 Fixed
 #KT-3894 Fixed
 #KT-3874 Fixed

compiler/testData/codegen/box/finally/kt3894.kt

@@ -0,0 +1,36 @@
+class MyString {
+    var s = ""
+    fun plus(x : String) : MyString {
+        s += x
+        return this
+    }
+
+    fun toString(): String {
+        return s
+    }
+}
+
+fun test1() : MyString {
+    var r = MyString()
+    while (true) {
+      try {
+          r + "Try"
+
+          if (true) {
+              r + "Break"
+              break
+          }
+
+      } finally {
+          return r + "Finally"
+      }
+    }
+}
+
+
+
+fun box(): String {
+    if (test1().toString() != "TryBreakFinally") return "fail1: ${test1().toString()}"
+
+    return "OK"
+}