JVM IR: recover accidentally lost backingField (KT-49998)

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

@@ -0,0 +1,29 @@
+// TARGET_BACKEND: JVM_IR
+// WITH_STDLIB
+// WITH_REFLECT
+// FULL_JDK
+
+annotation class Ann1(val value: UByte = 41u)
+annotation class Ann2(val value: UShort = 42u)
+annotation class Ann3(val value: UInt = 43u)
+annotation class Ann4(val value: ULong = 44u)
+
+@Ann1
+@Ann2
+@Ann3
+@Ann4
+class A
+
+fun box(): String {
+    val default1 = A::class.java.getAnnotation(Ann1::class.java).value
+    val default2 = A::class.java.getAnnotation(Ann2::class.java).value
+    val default3 = A::class.java.getAnnotation(Ann3::class.java).value
+    val default4 = A::class.java.getAnnotation(Ann4::class.java).value
+
+    return if (default1 == 41u.toUByte() &&
+        default2 == 42u.toUShort() &&
+        default3 == 43u &&
+        default4 == 44u.toULong()
+    ) "OK"
+    else "FAIL"
+}

compiler/testData/codegen/bytecodeText/annotationDefaultValueOfUnsigned.kt

@@ -0,0 +1,11 @@
+// TARGET_BACKEND: JVM_IR
+
+annotation class Ann1(val value: UByte = 41u)
+annotation class Ann2(val value: UShort = 42u)
+annotation class Ann3(val value: UInt = 43u)
+annotation class Ann4(val value: ULong = 44u)
+
+// 1 default=\(byte\)41
+// 1 default=\(short\)42
+// 1 default=43
+// 1 default=44L