Generate specialized 'toString' for inline classes when possible

#KT-25613

compiler/testData/codegen/bytecodeText/inlineClasses/inlineClassInGeneratedToString.kt

@@ -0,0 +1,17 @@
+// !LANGUAGE: +InlineClasses
+
+// FILE: Z.kt
+inline class Z(val value: Int)
+
+// FILE: test.kt
+data class Data(val z1: Z, val z2: Z)
+
+inline class Inline(val z: Z)
+
+// @Data.class:
+// 0 Z.box
+// 0 Z.unbox
+
+// @Inline.class:
+// 0 Z.box
+// 0 Z.unbox