Perform bytecode optimisations for inline classes

#KT-23742 Fixed

compiler/testData/codegen/bytecodeText/boxingOptimization/boxingAndEquals.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +InlineClasses
+
 // https://youtrack.jetbrains.com/issue/KT-15871
 
 // FILE: Test.kt
@@ -10,8 +12,20 @@ fun getAndCheckInt(a: Int, b: Int) =
 // 0 Value
 // 0 areEqual
 
+// FILE: TestInlined.kt
+
+fun getAndCheckInlinedInt(a: InlinedInt, b: InlinedInt) =
+        getAndCheck({ a }, { b })
+
+// @TestInlinedKt.class:
+// 0 valueOf
+// 0 Value
+// 0 areEqual
+// 0 INVOKESTATIC InlinedInt\$Erased.box
+// 0 INVOKEVIRTUAL InlinedInt.unbox
+
 // FILE: Inline.kt
 inline fun <T> getAndCheck(getFirst: () -> T, getSecond: () -> T) =
         getFirst() == getSecond()
 
-
+inline class InlinedInt(val x: Int)