[IR] Support isAssignable in builders and serialization.

plugins/parcelize/parcelize-compiler/src/org/jetbrains/kotlin/parcelize/ir/IrParcelSerializers.kt

@@ -320,7 +320,7 @@ class IrSparseArrayParcelSerializer(
                     }
 
                     val dec = context.irBuiltIns.intClass.getSimpleFunction("dec")!!
-                    +irSetVar(remainingSizeTemporary.symbol, irCall(dec).apply {
+                    +irSet(remainingSizeTemporary.symbol, irCall(dec).apply {
                         dispatchReceiver = irGet(remainingSizeTemporary)
                     })
                 }

plugins/parcelize/parcelize-compiler/src/org/jetbrains/kotlin/parcelize/ir/irUtils.kt

@@ -140,7 +140,7 @@ inline fun IrBlockBuilder.forUntil(upperBound: IrExpression, loopBody: IrBlockBu
         body = irBlock {
             loopBody(indexTemporary)
             val inc = context.irBuiltIns.intClass.getSimpleFunction("inc")!!
-            +irSetVar(indexTemporary.symbol, irCall(inc).apply {
+            +irSet(indexTemporary.symbol, irCall(inc).apply {
                 dispatchReceiver = irGet(indexTemporary)
             })
         }