[IR] Use standard copy mechanism in originalBeforeInline

It effectively behaves the same as before, but should be a bit cleaner.

Author: mcpiroman

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/CommonIrAttributes.kt

@@ -12,4 +12,4 @@ package org.jetbrains.kotlin.ir
  *
  * `null` <=> `this` element wasn't inlined.
  */
-var IrElement.originalBeforeInline: IrElement? by irAttribute(copyByDefault = false)
+var IrElement.originalBeforeInline: IrElement? by irAttribute(copyByDefault = true)

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/IrDeclarations.kt

@@ -21,7 +21,6 @@ import java.io.File
 fun IrElement.copyAttributes(other: IrElement, includeAll: Boolean = false) {
     (this as IrElementBase).copyAttributesFrom(other as IrElementBase, includeAll)
     attributeOwnerId = other.attributeOwnerId
-    originalBeforeInline = other.originalBeforeInline
 }
 
 val IrClass.isSingleFieldValueClass: Boolean