[Test] Mute failing FIR BB tests related to MPP

compiler/testData/codegen/box/ir/anonymousClassLeak.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 // DONT_TARGET_EXACT_BACKEND: WASM
 // WASM_MUTE_REASON: PROPERTY_REFERENCES
 // WITH_RUNTIME
@@ -87,4 +88,4 @@ fun box(): String {
     if (test1() != "!abcd") return "FAIL 1: ${test1()}"
     if (test2() != "zyxw") return "FAIL 2: ${test2()}"
     return test3()
-}
+}

compiler/testData/codegen/box/ir/serializationRegressions/genericProperty.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 // DONT_TARGET_EXACT_BACKEND: WASM
 // WASM_MUTE_REASON: PROPERTY_REFERENCES
 // IGNORE_BACKEND: NATIVE