[FIR] Mute some tests back due to KT-64081

They were accidentally fixed with `[FIR] Process all overridden members from intersection scopes`
  commit, which itself introduced incorrect behavior, which was properly
  fixed with ... commit. So KT-64081 started to appear again

compiler/testData/codegen/bytecodeText/falseSmartCast.kt

@@ -1,3 +1,5 @@
+// IGNORE_BACKEND_K2: JVM_IR
+
 open class SuperFoo {
     public fun bar() {
         if (this is Foo) {