[FIR] Add INLINE_PROPERTY_WITH_BACKING_FIELD diagnostic

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDataClassConverters.kt

@@ -3185,6 +3185,12 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.INLINE_PROPERTY_WITH_BACKING_FIELD) { firDiagnostic ->
+        InlinePropertyWithBackingFieldImpl(
+            firDiagnostic as FirPsiDiagnostic,
+            token,
+        )
+    }
     add(FirErrors.CANNOT_ALL_UNDER_IMPORT_FROM_SINGLETON) { firDiagnostic ->
         CannotAllUnderImportFromSingletonImpl(
             firDiagnostic.a,

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnostics.kt

@@ -2222,6 +2222,10 @@ sealed class KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         override val diagnosticClass get() = ReifiedTypeParameterInOverride::class
     }
 
+    abstract class InlinePropertyWithBackingField : KtFirDiagnostic<KtDeclaration>() {
+        override val diagnosticClass get() = InlinePropertyWithBackingField::class
+    }
+
     abstract class CannotAllUnderImportFromSingleton : KtFirDiagnostic<KtImportDirective>() {
         override val diagnosticClass get() = CannotAllUnderImportFromSingleton::class
         abstract val objectName: Name

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnosticsImpl.kt

@@ -3588,6 +3588,13 @@ internal class ReifiedTypeParameterInOverrideImpl(
     override val firDiagnostic: FirPsiDiagnostic by weakRef(firDiagnostic)
 }
 
+internal class InlinePropertyWithBackingFieldImpl(
+    firDiagnostic: FirPsiDiagnostic,
+    override val token: ValidityToken,
+) : KtFirDiagnostic.InlinePropertyWithBackingField(), KtAbstractFirDiagnostic<KtDeclaration> {
+    override val firDiagnostic: FirPsiDiagnostic by weakRef(firDiagnostic)
+}
+
 internal class CannotAllUnderImportFromSingletonImpl(
     override val objectName: Name,
     firDiagnostic: FirPsiDiagnostic,