[KT-42830][Reverse C Interop] Add API to get value of boxed primitives

Merge-request: KT-MR-6836
Merged-by: Vladimir Sukharev <Vladimir.Sukharev@jetbrains.com>

kotlin-native/backend.native/tests/produce_dynamic/kt-42830/box_unbox-main.out

@@ -0,0 +1,36 @@
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kotlin-native/backend.native/tests/produce_dynamic/kt-42830/box_unbox.kt

@@ -0,0 +1,45 @@
+/*
+ * 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.
+ */
+
+fun printAny(v: Any?) {
+    println(v)
+}
+
+fun printBoolean(v: Boolean) {
+    println(v)
+}
+fun printChar(v: Char) {
+    println(v)
+}
+fun printByte(v: Byte) {
+    println(v)
+}
+fun printShort(v: Short) {
+    println(v)
+}
+fun printInt(v: Int) {
+    println(v)
+}
+fun printLong(v: Long) {
+    println(v)
+}
+fun printFloat(v: Float) {
+    println(v)
+}
+fun printDouble(v: Double) {
+    println(v)
+}
+fun printUByte(v: UByte) {
+    println(v)
+}
+fun printUShort(v: UShort) {
+    println(v)
+}
+fun printUInt(v: UInt) {
+    println(v)
+}
+fun printULong(v: ULong) {
+    println(v)
+}

kotlin-native/backend.native/tests/produce_dynamic/kt-42830/main.c

@@ -0,0 +1,37 @@
+/*
+ * 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.
+ */
+#include "testlib_api.h"
+#define __ testlib_symbols()->
+#define T_(x) testlib_kref_ ## x
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <float.h>
+
+#define TEST_TYPE_VAL(TYPE_C, TYPE, VAL) \
+    TYPE_C primitive##TYPE = VAL; \
+    __ kotlin.root.print##TYPE   (primitive##TYPE); \
+    T_(kotlin_##TYPE) nullable##TYPE = __ createNullable##TYPE (primitive##TYPE); \
+    T_(kotlin_Any) any##TYPE = { .pinned = nullable##TYPE.pinned }; \
+    __ kotlin.root.printAny (any##TYPE); \
+    TYPE_C unboxed##TYPE = __ getNonNullValueOf##TYPE (nullable##TYPE); \
+    __ kotlin.root.print##TYPE   (unboxed##TYPE);
+
+
+int main(int argc, char** argv) {
+    TEST_TYPE_VAL(bool, Boolean, true);
+    TEST_TYPE_VAL(uint16_t, Char, UINT16_MAX);
+    TEST_TYPE_VAL(int8_t, Byte, INT8_MIN);
+    TEST_TYPE_VAL(int16_t, Short, INT16_MIN);
+    TEST_TYPE_VAL(int32_t, Int, INT32_MIN);
+    TEST_TYPE_VAL(int64_t, Long, INT64_MIN);
+    TEST_TYPE_VAL(float, Float, FLT_MAX);
+    TEST_TYPE_VAL(double, Double, DBL_MAX);
+    TEST_TYPE_VAL(uint8_t, UByte, UINT8_MAX);
+    TEST_TYPE_VAL(uint16_t, UShort, UINT16_MAX);
+    TEST_TYPE_VAL(uint32_t, UInt, UINT32_MAX);
+    TEST_TYPE_VAL(uint64_t, ULong, UINT64_MAX);
+}