IR: introduce buildReceiverParameter, use where possible

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

@@ -18,6 +18,7 @@ import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.builders.Scope
 import org.jetbrains.kotlin.ir.builders.declarations.IrTypeParameterBuilder
 import org.jetbrains.kotlin.ir.builders.declarations.build
+import org.jetbrains.kotlin.ir.builders.declarations.buildReceiverParameter
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.declarations.impl.IrConstructorImpl
 import org.jetbrains.kotlin.ir.declarations.impl.IrFunctionImpl
@@ -411,21 +412,7 @@ fun Scope.createTemporaryVariableWithWrappedDescriptor(
 }
 
 fun IrClass.createImplicitParameterDeclarationWithWrappedDescriptor() {
-    val thisReceiverDescriptor = WrappedReceiverParameterDescriptor()
-    thisReceiver = IrValueParameterImpl(
-        startOffset, endOffset,
-        IrDeclarationOrigin.INSTANCE_RECEIVER,
-        IrValueParameterSymbolImpl(thisReceiverDescriptor),
-        Name.special("<this>"),
-        index = -1,
-        type = symbol.typeWithParameters(typeParameters),
-        varargElementType = null,
-        isCrossinline = false,
-        isNoinline = false
-    ).also { valueParameter ->
-        thisReceiverDescriptor.bind(valueParameter)
-        valueParameter.parent = this
-    }
+    thisReceiver = buildReceiverParameter(this, IrDeclarationOrigin.INSTANCE_RECEIVER, symbol.typeWithParameters(typeParameters))
 }
 
 @Suppress("UNCHECKED_CAST")
@@ -446,23 +433,7 @@ fun IrClass.simpleFunctions() = declarations.flatMap {
 
 fun IrClass.createParameterDeclarations() {
     assert(thisReceiver == null)
-
-    thisReceiver = WrappedReceiverParameterDescriptor().let {
-        IrValueParameterImpl(
-            startOffset, endOffset,
-            IrDeclarationOrigin.INSTANCE_RECEIVER,
-            IrValueParameterSymbolImpl(it),
-            Name.special("<this>"),
-            0,
-            symbol.typeWithParameters(typeParameters),
-            null,
-            false,
-            false
-        ).apply {
-            it.bind(this)
-            parent = this@createParameterDeclarations
-        }
-    }
+    thisReceiver = buildReceiverParameter(this, IrDeclarationOrigin.INSTANCE_RECEIVER, symbol.typeWithParameters(typeParameters))
 }
 
 @OptIn(ObsoleteDescriptorBasedAPI::class)

compiler/ir/backend.common/src/org/jetbrains/kotlin/ir/builders/declarations/declarationBuilders.kt

@@ -218,6 +218,25 @@ inline fun IrClass.addConstructor(builder: IrFunctionBuilder.() -> Unit = {}): I
         constructor.parent = this@addConstructor
     }
 
+private val RECEIVER_PARAMETER_NAME = Name.special("<this>")
+
+fun buildReceiverParameter(
+    parent: IrDeclarationParent,
+    origin: IrDeclarationOrigin,
+    type: IrType,
+    startOffset: Int = parent.startOffset,
+    endOffset: Int = parent.endOffset
+): IrValueParameter = WrappedReceiverParameterDescriptor().let { wrappedDescriptor ->
+    IrValueParameterImpl(
+        startOffset, endOffset, origin,
+        IrValueParameterSymbolImpl(wrappedDescriptor),
+        RECEIVER_PARAMETER_NAME, -1, type, null, isCrossinline = false, isNoinline = false
+    ).also {
+        wrappedDescriptor.bind(it)
+        it.parent = parent
+    }
+}
+
 @PublishedApi
 internal fun IrValueParameterBuilder.buildValueParameter(parent: IrDeclarationParent): IrValueParameter {
     val wrappedDescriptor = WrappedValueParameterDescriptor(wrappedDescriptorAnnotations)