Check that quick fixes don't produce new errors

idea/testData/quickfix/expressions/afterUnnecessaryNonNullAssertion1.kt

@@ -1,4 +1,4 @@
 // "Remove unnecessary non-null assertion (!!)" "true"
 fun test(value : Int) : Int {
-    value<caret>
+    return value<caret>
 }

idea/testData/quickfix/expressions/afterUnnecessaryNonNullAssertion2.kt

@@ -1,4 +1,4 @@
 // "Replace with dot call" "true"
-fun test(value : String) : Int {
-    return value<caret>.length()
+fun test(value : String) {
+    value<caret>.equals("test")
 }

idea/testData/quickfix/expressions/beforeUnnecessaryNonNullAssertion1.kt

@@ -1,4 +1,4 @@
 // "Remove unnecessary non-null assertion (!!)" "true"
 fun test(value : Int) : Int {
-    value<caret>!!
+    return value<caret>!!
 }

idea/testData/quickfix/expressions/beforeUnnecessaryNonNullAssertion2.kt

@@ -1,4 +1,4 @@
 // "Replace with dot call" "true"
-fun test(value : String) : Int {
-    return value<caret>!!.length()
+fun test(value : String) {
+    value!!<caret>.equals("test")
 }