Add accessor tests: inline class <-> companion

KT-26858 was fixed somewhere in the middle.

 #KT26858

compiler/testData/codegen/box/inlineClasses/contextsAndAccessors/accessPrivateInlineClassCompanionMethod.kt

@@ -0,0 +1,12 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+inline class R(private val r: Int) {
+    fun test() = ok()
+
+    companion object {
+        private fun ok() = "OK"
+    }
+}
+
+fun box() = R(0).test()

compiler/testData/codegen/box/inlineClasses/contextsAndAccessors/accessPrivateInlineClassCompanionMethod2.kt

@@ -0,0 +1,12 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+inline class R(private val r: Long) {
+    fun test() = ok()
+
+    companion object {
+        private fun ok() = "OK"
+    }
+}
+
+fun box() = R(0).test()

compiler/testData/codegen/box/inlineClasses/contextsAndAccessors/accessPrivateInlineClassMethodFromCompanion.kt

@@ -0,0 +1,12 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+inline class R(private val r: Int) {
+    private fun ok() = "OK"
+
+    companion object {
+        fun test(r: R) = r.ok()
+    }
+}
+
+fun box() = R.test(R(0))

compiler/testData/codegen/box/inlineClasses/contextsAndAccessors/accessPrivateInlineClassMethodFromCompanion2.kt

@@ -0,0 +1,12 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+inline class R(private val r: Long) {
+    private fun ok() = "OK"
+
+    companion object {
+        fun test(r: R) = r.ok()
+    }
+}
+
+fun box() = R.test(R(0))

compiler/testData/codegen/box/inlineClasses/contextsAndAccessors/accessPrivateStaticInlineClassCompanionMethod.kt

@@ -0,0 +1,14 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JS, JS_IR, JVM_IR
+// WITH_RUNTIME
+
+inline class R(private val r: Int) {
+    fun test() = ok()
+
+    companion object {
+        @JvmStatic
+        private fun ok() = "OK"
+    }
+}
+
+fun box() = R(0).test()

compiler/testData/codegen/box/inlineClasses/contextsAndAccessors/kt26858.kt

@@ -0,0 +1,24 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+inline class Direction(private val direction: Int) {
+    fun dx() = dx[direction]
+    fun dy() = dy[direction]
+
+    companion object {
+        private val dx = intArrayOf(0, 1, 0, -1)
+        private val dy = intArrayOf(-1, 0, 1, 0)
+    }
+}
+
+fun box(): String {
+    val dirs = arrayOf(Direction(0), Direction(1), Direction(2), Direction(3))
+    val expectedDx = intArrayOf(0, 1, 0, -1)
+    val expectedDy = intArrayOf(-1, 0, 1, 0)
+    for (i in 0 .. 3) {
+        if (dirs[i].dx() != expectedDx[i]) throw AssertionError()
+        if (dirs[i].dy() != expectedDy[i]) throw AssertionError()
+    }
+
+    return "OK"
+}