Private visibility for non-const, non-jvmField class companion property backing field

compiler/testData/compileJavaAgainstKotlin/staticFields/AnnotationClass.kt

@@ -11,13 +11,13 @@ annotation class AFloat(val value: Float)
 class Test {
 
     companion object {
-        val vstring: String = "Test"
-        val vchar: Char = 'c'
-        val vint: Int = 10
-        val vbyte: Byte = 11
-        val vlong: Long = 12
-        val vdouble: Double = 1.2
-        val vfloat: Float = 1.3.toFloat()
+        const val vstring: String = "Test"
+        const val vchar: Char = 'c'
+        const val vint: Int = 10
+        const val vbyte: Byte = 11
+        const val vlong: Long = 12
+        const val vdouble: Double = 1.2
+        const val vfloat: Float = 1.3.toFloat()
     }
 
 }