KT53100: Optimization: <T-unbox>(CONSTANT_PRIMITIVE(x: T?)) => x

Merge-request: KT-MR-6684
Merged-by: Vladimir Sukharev <Vladimir.Sukharev@jetbrains.com>

kotlin-native/backend.native/tests/codegen/boxing/kt53100_casts.kt

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+/*
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package codegen.boxing.kt53100_casts
+
+import kotlin.test.*
+
+// Reproducer is copied from FloatingPointParser.unaryMinus()
+inline fun <reified T> unaryMinus(value: T): T {
+    return when (value) {
+        is Float -> -value as T
+        is Double -> -value as T
+        else -> throw NumberFormatException()
+    }
+}
+
+@Test fun runTest(){
+    println(unaryMinus(0.0))
+    println(unaryMinus(0.0f))
+}

kotlin-native/backend.native/tests/codegen/boxing/kt53100_casts.out

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+-0.0
+-0.0