Report warning on "suspend {}"-like calls based on variable

#KT-22892 Fixed

compiler/testData/diagnostics/testsWithStdLib/coroutines/nonModifierFormForBuiltIn.kt

@@ -34,3 +34,12 @@ fun bar() {
 @Target(AnnotationTarget.EXPRESSION)
 @Retention(AnnotationRetention.SOURCE)
 annotation class Ann
+
+fun main(suspend: WLambdaInvoke) {
+
+    <!MODIFIER_FORM_FOR_NON_BUILT_IN_SUSPEND!>suspend<!> {}
+}
+
+class WLambdaInvoke {
+    operator fun invoke(<!UNUSED_PARAMETER!>l<!>: () -> Unit) {}
+}