Psi2ir: support mode without generation of bodies

This is needed for kapt + JVM IR.

 #KT-49682

compiler/ir/backend.jvm/entrypoint/src/org/jetbrains/kotlin/backend/jvm/JvmIrCodegenFactory.kt

@@ -88,7 +88,14 @@ open class JvmIrCodegenFactory(
                 val symbolTable = SymbolTable(signaturer, IrFactoryImpl)
                 mangler to symbolTable
             }
-        val psi2ir = Psi2IrTranslator(input.languageVersionSettings, Psi2IrConfiguration(input.ignoreErrors))
+        val psi2ir = Psi2IrTranslator(
+            input.languageVersionSettings,
+            Psi2IrConfiguration(
+                input.ignoreErrors,
+                allowUnboundSymbols = false,
+                input.skipBodies,
+            )
+        )
         val messageLogger = input.configuration[IrMessageLogger.IR_MESSAGE_LOGGER] ?: IrMessageLogger.None
         val psi2irContext = psi2ir.createGeneratorContext(
             input.module,

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

@@ -121,7 +121,7 @@ private class MoveOrCopyCompanionObjectFieldsLowering(val context: JvmBackendCon
                 parent = newParent
                 correspondingPropertySymbol = property.symbol
                 annotations += oldField.annotations
-                initializer = with(oldField.initializer!!) {
+                initializer = oldField.initializer?.run {
                     IrExpressionBodyImpl(startOffset, endOffset, (expression as IrConst<*>).shallowCopy())
                 }