FIR checker: warn unnecessary non-null assertions

compiler/fir/analysis-tests/testData/resolveWithStdlib/hashSet.kt

@@ -16,5 +16,5 @@ fun foo() {
     var c: MutableSet<String>? = null
     c = HashSet()
 
-    c!!.d = produce()
-}
+    c<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>.d = produce()
+}

compiler/fir/analysis-tests/testData/resolveWithStdlib/problems/SpecialCallsWithLambdas.kt

@@ -1,4 +1,4 @@
 fun foo() {
-    val inv = {{}}!!
+    val inv = {{}}<!NOT_NULL_ASSERTION_ON_LAMBDA_EXPRESSION!>!!<!>
     val bar = {{}}
 }