Replaced sure() invocations with '!!' operator in diagnostic tests.

compiler/testData/diagnostics/tests/controlFlowAnalysis/kt1189.kt

@@ -3,7 +3,7 @@ package kt1189
 import java.util.concurrent.locks.ReentrantReadWriteLock
 
 inline fun <T> ReentrantReadWriteLock.write(action: ()->T) : T {
-    val rl = readLock().sure()
+    val rl = readLock()!!
     var readCount = 0
     val writeCount = getWriteHoldCount()
     if(writeCount == 0) {
@@ -13,7 +13,7 @@ inline fun <T> ReentrantReadWriteLock.write(action: ()->T) : T {
                 rl.unlock()
     }
 
-    val wl = writeLock().sure()
+    val wl = writeLock()!!
     wl.lock()
     try {
         return action()

compiler/testData/diagnostics/tests/extensions/GenericIterator.kt

@@ -14,7 +14,7 @@ fun <T : Any> T?.iterator() = object {
     fun next() : T {
         if (hasNext) {
             hasNext = false
-            return this@iterator.sure()
+            return this@iterator!!
         }
         throw java.util.NoSuchElementException()
     }

compiler/testData/diagnostics/tests/inference/regressions/kt702.kt

@@ -7,7 +7,7 @@ fun getJavaClass<T>() : java.lang.Class<T> { <!NO_RETURN_IN_FUNCTION_WITH_BLOCK_
 public class Throwables() {
     class object {
         public fun propagateIfInstanceOf<X : Throwable?>(throwable : Throwable?, declaredType : Class<X?>?) : Unit {
-            if (((throwable != null) && declaredType?.isInstance(throwable).sure()))
+            if (((throwable != null) && declaredType?.isInstance(throwable)!!))
             {
                 throw declaredType?.cast(throwable)!!
             }

compiler/testData/diagnostics/tests/jdk-annotations/ArrayListAndMap.kt

@@ -27,5 +27,5 @@ fun test(a : List<Int>, m : Map<String, Int>) {
   )
   HashMap<Int, Int>().get(0)
   if (m.get("") != null)
-  System.out.println(m.get("").sure().plus(1))
+  System.out.println(m.get("")!!.plus(1))
 }

compiler/testData/diagnostics/tests/regressions/kt701.kt

@@ -4,9 +4,9 @@ fun getJavaClass<T>() : java.lang.Class<T> { return "" <!CAST_NEVER_SUCCEEDS!>as
 public class Throwables() {
     class object {
         public fun propagateIfInstanceOf<X : Throwable?>(throwable : Throwable?, declaredType : Class<X?>?) {
-            if (((throwable != null) && declaredType?.isInstance(throwable).sure()))
+            if (((throwable != null) && declaredType?.isInstance(throwable)!!))
             {
-                throw declaredType?.cast(throwable).sure()
+                throw declaredType?.cast(throwable)!!
             }
         }
         public fun propagateIfPossible(throwable : Throwable?) {