[Native] Drop irSetVar from IrUtils2

We can reuse `irSet` function

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ir/interop/cenum/CEnumByValueFunctionGenerator.kt

@@ -82,7 +82,7 @@ internal class CEnumByValueFunctionGenerator(
                                     type = irBuiltIns.unitType,
                                     condition = irEquals(entryValue, irGet(irValueParameter)),
                                     thenPart = irReturn(irGet(entry)),
-                                    elsePart = irSetVar(
+                                    elsePart = irSet(
                                             inductionVariable,
                                             irCallOp(plusFun, irBuiltIns.intType,
                                                     irGet(inductionVariable),

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/NativeSuspendFunctionLowering.kt

@@ -159,7 +159,7 @@ internal class NativeSuspendFunctionsLowering(
                                     val scope = liveLocals[suspensionPoint]!!
                                     return irBlock(expression) {
                                         scope.forEach {
-                                            +irSetVar(localsMap[it]
+                                            +irSet(localsMap[it]
                                                     ?: it, irGetField(irGet(thisReceiver), localToPropertyMap[it.symbol]!!))
                                         }
                                     }

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/ir/util/IrUtils2.kt

@@ -173,9 +173,6 @@ fun IrBuilderWithScope.irCallOp(
             putValueArgument(0, argument)
         }
 
-fun IrBuilderWithScope.irSetVar(variable: IrVariable, value: IrExpression) =
-        irSet(variable.symbol, value)
-
 fun IrBuilderWithScope.irCatch(type: IrType) =
         IrCatchImpl(
                 startOffset, endOffset,