[IR] Move IrDeclaration.isExpect to IrUtils

^KT-62292

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/ExpectSymbolTransformer.kt

@@ -17,6 +17,7 @@ import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.symbols.IrConstructorSymbol
 import org.jetbrains.kotlin.ir.symbols.IrPropertySymbol
 import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
+import org.jetbrains.kotlin.ir.util.isExpect
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 
 /**

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/descriptorBasedUtils.kt

@@ -1,24 +0,0 @@
-/*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package org.jetbrains.kotlin.backend.common.ir
-
-import org.jetbrains.kotlin.ir.declarations.*
-
-val IrDeclaration.isExpect
-    get() = this is IrClass && isExpect ||
-            this is IrFunction && isExpect ||
-            this is IrProperty && isExpect
-
-// The original isExpect represents what user has written.
-// This predicate means "there can possibly exist an 'actual' for the given declaration".
-// Shouldn't it be incorporated to descriptor -> ir declaration psi2ir translation phase?
-val IrDeclaration.isProperExpect: Boolean
-    get() = this is IrClass && isExpect ||
-            this is IrFunction && isExpect ||
-            this is IrProperty && isExpect ||
-            (this is IrClass || this is IrFunction || this is IrProperty || this is IrEnumEntry || this is IrTypeParameter)
-            && (this.parent as? IrDeclaration)?.isProperExpect ?: false
-