Use proper KotlinType for prefix increment/decrement

Otherwise inline class values (such as UByte) are boxed incorrectly,
see KT-26219.

compiler/testData/codegen/box/unsignedTypes/unsignedTypePrefixIncrementDecrementBoxing.kt

@@ -0,0 +1,117 @@
+// WITH_UNSIGNED
+// IGNORE_BACKEND: JS_IR, JVM_IR, JS
+
+fun prefixDecrementUByteLocal(): Any? {
+    var a: UByte = 0u
+    return --a
+}
+
+fun prefixDecrementUShortLocal(): Any? {
+    var a: UShort = 0u
+    return --a
+}
+
+fun prefixDecrementUIntLocal(): Any? {
+    var a: UInt = 0u
+    return --a
+}
+
+fun prefixDecrementULongLocal(): Any? {
+    var a: ULong = 0u
+    return --a
+}
+
+fun prefixIncrementUByteLocal(): Any? {
+    var a: UByte = 0u
+    return ++a
+}
+
+fun prefixIncrementUShortLocal(): Any? {
+    var a: UShort = 0u
+    return ++a
+}
+
+fun prefixIncrementUIntLocal(): Any? {
+    var a: UInt = 0u
+    return ++a
+}
+
+fun prefixIncrementULongLocal(): Any? {
+    var a: ULong = 0u
+    return ++a
+}
+
+var gb: UByte = 0u
+var gs: UShort = 0u
+var gi: UInt = 0u
+var gl: ULong = 0UL
+
+fun prefixDecrementUByteProperty(): Any? {
+    gb = 0u
+    return --gb
+}
+
+fun prefixDecrementUShortProperty(): Any? {
+    gs = 0u
+    return --gs
+}
+
+fun prefixDecrementUIntProperty(): Any? {
+    gi = 0u
+    return --gi
+}
+
+fun prefixDecrementULongProperty(): Any? {
+    gl = 0u
+    return --gl
+}
+
+fun prefixIncrementUByteProperty(): Any? {
+    gb = 0u
+    return ++gb
+}
+
+fun prefixIncrementUShortProperty(): Any? {
+    gs = 0u
+    return ++gs
+}
+
+fun prefixIncrementUIntProperty(): Any? {
+    gi = 0u
+    return ++gi
+}
+
+fun prefixIncrementULongProperty(): Any? {
+    gl = 0u
+    return ++gl
+}
+
+fun check(u: Any?, ts: String, className: String) {
+    u!!
+    if (u.toString() != ts) throw AssertionError(u.toString())
+    if (u.javaClass.name != className) throw AssertionError(u.javaClass.name)
+}
+
+fun box(): String {
+    check(prefixDecrementUByteLocal(), 0xFFu.toString(), "kotlin.UByte")
+    check(prefixDecrementUShortLocal(), 0xFFFFu.toString(), "kotlin.UShort")
+    check(prefixDecrementUIntLocal(), 0xFFFF_FFFFu.toString(), "kotlin.UInt")
+    check(prefixDecrementULongLocal(), 0xFFFF_FFFF_FFFF_FFFFUL.toString(), "kotlin.ULong")
+
+    check(prefixIncrementUByteLocal(), "1", "kotlin.UByte")
+    check(prefixIncrementUShortLocal(), "1", "kotlin.UShort")
+    check(prefixIncrementUIntLocal(), "1", "kotlin.UInt")
+    check(prefixIncrementULongLocal(), "1", "kotlin.ULong")
+
+    check(prefixDecrementUByteProperty(), 0xFFu.toString(), "kotlin.UByte")
+    check(prefixDecrementUShortProperty(), 0xFFFFu.toString(), "kotlin.UShort")
+    check(prefixDecrementUIntProperty(), 0xFFFF_FFFFu.toString(), "kotlin.UInt")
+    check(prefixDecrementULongProperty(), 0xFFFF_FFFF_FFFF_FFFFUL.toString(), "kotlin.ULong")
+
+    check(prefixIncrementUByteProperty(), "1", "kotlin.UByte")
+    check(prefixIncrementUShortProperty(), "1", "kotlin.UShort")
+    check(prefixIncrementUIntProperty(), "1", "kotlin.UInt")
+    check(prefixIncrementULongProperty(), "1", "kotlin.ULong")
+
+    return "OK"
+}