KT-12628: !! is now correctly added to array expressions

(cherry picked from commit 56c9d7e)

idea/testData/quickfix/expressions/unsafeCall4.kt

@@ -0,0 +1,4 @@
+// "Add non-null asserted (!!) call" "true"
+
+operator fun Int.get(row: Int, column: Int) = this
+fun foo(arg: Int?) = arg<caret>[42, 13]

idea/testData/quickfix/expressions/unsafeCall4.kt.after

@@ -0,0 +1,4 @@
+// "Add non-null asserted (!!) call" "true"
+
+operator fun Int.get(row: Int, column: Int) = this
+fun foo(arg: Int?) = arg!![42, 13]

idea/testData/quickfix/expressions/unsafeCall5.kt

@@ -0,0 +1,4 @@
+// "Add non-null asserted (!!) call" "true"
+
+operator fun Int.get(row: Int, column: Int) = if (row == column) this else null
+fun foo(arg: Int) = arg[42, 13]<caret>.hashCode()

idea/testData/quickfix/expressions/unsafeCall5.kt.after

@@ -0,0 +1,4 @@
+// "Add non-null asserted (!!) call" "true"
+
+operator fun Int.get(row: Int, column: Int) = if (row == column) this else null
+fun foo(arg: Int) = arg[42, 13]!!.hashCode()