Perform bytecode optimisations for inline classes

#KT-23742 Fixed

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

@@ -7,39 +7,39 @@ inline class InlineNullableReference(val a: Any?)
 
 fun test1(a: InlineNotNullPrimitive) {
     val a0 = a
-    val a1: Any = a // box
-    val a2: Any? = a // box
+    val a1: Any = a
+    val a2: Any? = a
     val a3: InlineNotNullPrimitive = a
-    val a4: InlineNotNullPrimitive? = a // box
+    val a4: InlineNotNullPrimitive? = a
 }
 
 fun test2(b: InlineNullablePrimitive) {
     val b0 = b
-    val b1: Any = b // box
-    val b2: Any? = b // box
+    val b1: Any = b
+    val b2: Any? = b
     val b3: InlineNullablePrimitive = b
-    val b4: InlineNullablePrimitive? = b // box
+    val b4: InlineNullablePrimitive? = b
 }
 
 fun test3(c: InlineNotNullReference) {
     val c0 = c
-    val c1: Any = c // box
-    val c2: Any? = c // box
+    val c1: Any = c
+    val c2: Any? = c
     val c3: InlineNotNullReference = c
     val c4: InlineNotNullReference? = c
 }
 
 fun test4(d: InlineNullableReference) {
     val d0 = d
-    val d1: Any = d // box
-    val d2: Any? = d // box
+    val d1: Any = d
+    val d2: Any? = d
     val d3: InlineNullableReference = d
-    val d4: InlineNullableReference? = d // box
+    val d4: InlineNullableReference? = d
 }
 
-// 3 INVOKESTATIC InlineNotNullPrimitive\$Erased.box
-// 3 INVOKESTATIC InlineNullablePrimitive\$Erased.box
-// 2 INVOKESTATIC InlineNotNullReference\$Erased.box
-// 3 INVOKESTATIC InlineNullableReference\$Erased.box
+// 0 INVOKESTATIC InlineNotNullPrimitive\$Erased.box
+// 0 INVOKESTATIC InlineNullablePrimitive\$Erased.box
+// 0 INVOKESTATIC InlineNotNullReference\$Erased.box
+// 0 INVOKESTATIC InlineNullableReference\$Erased.box
 
 // 0 valueOf