FIR IDE: Don't offer AddExclExclCallFix when expression is definitely

null.

idea/testData/quickfix/addExclExclCall/nullExpression.kt

@@ -8,7 +8,4 @@ fun foo(arg: String?) {
     if (arg == null) {
         val x: String = arg<caret>
     }
-}
-
-// TODO: Need data flow info from null check
-/* IGNORE_FIR */
+}

idea/testData/quickfix/addExclExclCall/nullReceiver.fir.kt

@@ -0,0 +1,7 @@
+// "Add non-null asserted (!!) call" "false"
+
+fun foo(arg: String?) {
+    if (arg == null) {
+        arg<caret>.length
+    }
+}

idea/testData/quickfix/addExclExclCall/nullReceiver.kt

@@ -0,0 +1,8 @@
+// "Add non-null asserted (!!) call" "true"
+// DISABLE-ERRORS
+
+fun foo(arg: String?) {
+    if (arg == null) {
+        arg<caret>.length
+    }
+}

idea/testData/quickfix/addExclExclCall/nullReceiver.kt.after

@@ -0,0 +1,8 @@
+// "Add non-null asserted (!!) call" "true"
+// DISABLE-ERRORS
+
+fun foo(arg: String?) {
+    if (arg == null) {
+        arg!!.length
+    }
+}

idea/testData/quickfix/addExclExclCall/typeMismatch/argumentAfterNullCheck.kt

@@ -12,7 +12,4 @@ fun test(i: Int?) {
     }
 }
 
-fun other(i: Int) {}
-
-// TODO: Need data flow info from null check
-/* IGNORE_FIR */
+fun other(i: Int) {}