Add a fallback flag -Xno-unified-null-checks for KT-22275

#KT-41482 Fixed

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JVMCompilerArguments.kt

@@ -352,6 +352,12 @@ class K2JVMCompilerArguments : CommonCompilerArguments() {
     )
     var noKotlinNothingValueException: Boolean by FreezableVar(false)
 
+    @Argument(
+        value = "-Xno-unified-null-checks",
+        description = "Use pre-1.4 exception types in null checks instead of java.lang.NPE. See KT-22275 for more details"
+    )
+    var noUnifiedNullChecks: Boolean by FreezableVar(false)
+
     @Argument(
         value = "-Xprofile",
         valueDescription = "<profilerPath:command:outputDir>",