[FIR] Allow annotation instantiation.

This commit disables the frontend error reporting for supported cases.

compiler/testData/codegen/boxInline/annotations/instanceInAnonymousClass.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // IGNORE_BACKEND: JVM
 // IGNORE_BACKEND: WASM
 // IGNORE_BACKEND_MULTI_MODULE: JVM, JVM_MULTI_MODULE_IR_AGAINST_OLD
@@ -34,4 +33,4 @@ class C() {
 
 fun box(): String {
     return C().one().i
-}
+}