[JVM_IR] Set correct origin for new variables on MFVC flattening.

Preserve information that variable is temporary while flattening.
Otherwise, unnecessary bytecode for them might be generated.

compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/lower/JvmMultiFieldValueClassLowering.kt

@@ -30,10 +30,7 @@ import org.jetbrains.kotlin.ir.expressions.impl.IrConstructorCallImpl
 import org.jetbrains.kotlin.ir.expressions.impl.IrDelegatingConstructorCallImpl
 import org.jetbrains.kotlin.ir.expressions.impl.IrEnumConstructorCallImpl
 import org.jetbrains.kotlin.ir.expressions.impl.IrFunctionReferenceImpl
-import org.jetbrains.kotlin.ir.symbols.IrConstructorSymbol
+import org.jetbrains.kotlin.ir.symbols.*
-import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
-import org.jetbrains.kotlin.ir.symbols.IrSymbol
-import org.jetbrains.kotlin.ir.symbols.IrValueSymbol
 import org.jetbrains.kotlin.ir.symbols.impl.IrAnonymousInitializerSymbolImpl
 import org.jetbrains.kotlin.ir.transformStatement
 import org.jetbrains.kotlin.ir.types.*
@@ -877,6 +874,7 @@ internal class JvmMultiFieldValueClassLowering(
                         name = Name.identifier("constructor_tmp"),
                         saveVariable = ::variablesSaver,
                         isVar = false,
+                        origin = JvmLoweredDeclarationOrigin.MULTI_FIELD_VALUE_CLASS_REPRESENTATION_VARIABLE
                     )
                     for (valueDeclaration in instance.valueDeclarations) {
                         valueDeclaration.origin = JvmLoweredDeclarationOrigin.TEMPORARY_MULTI_FIELD_VALUE_CLASS_VARIABLE
@@ -1173,14 +1171,25 @@ internal class JvmMultiFieldValueClassLowering(
             }
         }.unwrapBlock()
 
+    private val IrDeclarationOrigin.isTemporary
+        get() =
+            this == IrDeclarationOrigin.IR_TEMPORARY_VARIABLE
+                    || this == IrDeclarationOrigin.IR_TEMPORARY_VARIABLE_FOR_INLINED_EXTENSION_RECEIVER
+                    || this == IrDeclarationOrigin.IR_TEMPORARY_VARIABLE_FOR_INLINED_PARAMETER
+
     override fun visitVariable(declaration: IrVariable): IrStatement {
         val initializer = declaration.initializer
         if (declaration.type.needsMfvcFlattening()) {
             val irClass = declaration.type.erasedUpperBound
             val rootNode = replacements.getRootMfvcNode(irClass)
             return context.createJvmIrBuilder(getCurrentScopeSymbol(), declaration).irBlock {
+                val origin = if (declaration.origin.isTemporary) {
+                    JvmLoweredDeclarationOrigin.TEMPORARY_MULTI_FIELD_VALUE_CLASS_VARIABLE
+                } else {
+                    JvmLoweredDeclarationOrigin.MULTI_FIELD_VALUE_CLASS_REPRESENTATION_VARIABLE
+                }
                 val instance = rootNode.createInstanceFromValueDeclarationsAndBoxType(
-                    this, declaration.type as IrSimpleType, declaration.name, ::variablesSaver, declaration.isVar
+                    this, declaration.type as IrSimpleType, declaration.name, ::variablesSaver, declaration.isVar, origin
                 )
                 valueDeclarationsRemapper.registerReplacement(declaration, instance)
                 initializer?.let {

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/MfvcNode.kt

@@ -61,20 +61,31 @@ fun MfvcNode.createInstanceFromBox(
  * Create instance-specific [ValueDeclarationMfvcNodeInstance] from instance-agnostic [MfvcNode] using new flattened variables as data source.
  */
 fun MfvcNode.createInstanceFromValueDeclarationsAndBoxType(
-    scope: IrBuilderWithScope, type: IrSimpleType, name: Name, saveVariable: (IrVariable) -> Unit, isVar: Boolean
+    scope: IrBuilderWithScope,
-): ValueDeclarationMfvcNodeInstance = createInstanceFromValueDeclarations(scope, makeTypeArgumentsFromType(type), name, saveVariable, isVar)
+    type: IrSimpleType,
+    name: Name,
+    saveVariable: (IrVariable) -> Unit,
+    isVar: Boolean,
+    origin: IrDeclarationOrigin,
+): ValueDeclarationMfvcNodeInstance =
+    createInstanceFromValueDeclarations(scope, makeTypeArgumentsFromType(type), name, saveVariable, isVar, origin)
 
 /**
  * Create instance-specific [ValueDeclarationMfvcNodeInstance] from instance-agnostic [MfvcNode] using new flattened variables as data source.
  */
 fun MfvcNode.createInstanceFromValueDeclarations(
-    scope: IrBuilderWithScope, typeArguments: TypeArguments, name: Name, saveVariable: (IrVariable) -> Unit, isVar: Boolean
+    scope: IrBuilderWithScope,
+    typeArguments: TypeArguments,
+    name: Name,
+    saveVariable: (IrVariable) -> Unit,
+    isVar: Boolean,
+    origin: IrDeclarationOrigin,
 ): ValueDeclarationMfvcNodeInstance {
     val valueDeclarations = mapLeaves {
         scope.savableStandaloneVariable(
             type = it.type,
             name = listOf(name, it.fullFieldName).joinToString("-"),
-            origin = JvmLoweredDeclarationOrigin.MULTI_FIELD_VALUE_CLASS_REPRESENTATION_VARIABLE,
+            origin = origin,
             saveVariable = saveVariable,
             isVar = isVar,
         )

compiler/testData/codegen/box/valueClasses/inlineFunctions.kt

@@ -1,6 +1,5 @@
 // LANGUAGE: +ValueClasses
 // TARGET_BACKEND: JVM_IR
-// IGNORE_INLINER: IR
 // CHECK_BYTECODE_LISTING
 // WITH_STDLIB
 // CHECK_BYTECODE_TEXT