[FIR] Add PLATFORM_CLASS_MAPPED_TO_KOTLIN

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

@@ -1897,6 +1897,13 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.PLATFORM_CLASS_MAPPED_TO_KOTLIN) { firDiagnostic ->
+        PlatformClassMappedToKotlinImpl(
+            firDiagnostic.a,
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
     add(FirErrors.EXTENSION_IN_CLASS_REFERENCE_NOT_ALLOWED) { firDiagnostic ->
         ExtensionInClassReferenceNotAllowedImpl(
             firSymbolBuilder.callableBuilder.buildCallableSymbol(firDiagnostic.a.fir),

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

@@ -1352,6 +1352,11 @@ sealed class KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         override val diagnosticClass get() = RedundantNullable::class
     }
 
+    abstract class PlatformClassMappedToKotlin : KtFirDiagnostic<PsiElement>() {
+        override val diagnosticClass get() = PlatformClassMappedToKotlin::class
+        abstract val kotlinClass: FqName
+    }
+
     abstract class ExtensionInClassReferenceNotAllowed : KtFirDiagnostic<KtExpression>() {
         override val diagnosticClass get() = ExtensionInClassReferenceNotAllowed::class
         abstract val referencedDeclaration: KtCallableSymbol

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

@@ -1622,6 +1622,12 @@ internal class RedundantNullableImpl(
     override val token: ValidityToken,
 ) : KtFirDiagnostic.RedundantNullable(), KtAbstractFirDiagnostic<KtTypeReference>
 
+internal class PlatformClassMappedToKotlinImpl(
+    override val kotlinClass: FqName,
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: ValidityToken,
+) : KtFirDiagnostic.PlatformClassMappedToKotlin(), KtAbstractFirDiagnostic<PsiElement>
+
 internal class ExtensionInClassReferenceNotAllowedImpl(
     override val referencedDeclaration: KtCallableSymbol,
     override val firDiagnostic: KtPsiDiagnostic,