JVM IR: do not erase static fields in annotation classes

compiler/testData/codegen/box/annotations/constValInAnnotation.kt

@@ -2,7 +2,6 @@
 // IGNORE_BACKEND_FIR: JVM_IR
 // WITH_RUNTIME
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND: JVM_IR
 // FILE: Foo.java
 
 @Anno(Anno.CONST)
@@ -18,4 +17,3 @@ annotation class Anno(val value: Int) {
 
 fun box(): String =
         if ((Foo::class.java.annotations.single() as Anno).value == 42) "OK" else "Fail"
-