Minor: constructor IrExpressionBodyImpl(IrExpression)

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/impl/IrExpressionBodyImpl.kt

@@ -27,6 +27,8 @@ class IrExpressionBodyImpl(startOffset: Int, endOffset: Int) : IrElementBase(sta
         this.expression = expression
     }
 
+    constructor(expression: IrExpression) : this(expression.startOffset, expression.endOffset, expression)
+
     override lateinit var expression: IrExpression
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DeepCopyIrTree.kt

@@ -178,10 +178,7 @@ open class DeepCopyIrTree : IrElementTransformerVoid() {
             throw IllegalArgumentException("Unsupported body type: $body")
 
     override fun visitExpressionBody(body: IrExpressionBody): IrExpressionBody =
-            IrExpressionBodyImpl(
-                    body.startOffset, body.endOffset,
-                    body.expression.transform(this, null)
-            )
+            IrExpressionBodyImpl(body.expression.transform(this, null))
 
     override fun visitBlockBody(body: IrBlockBody): IrBlockBody =
             IrBlockBodyImpl(