Add new metadata flag for class files compiled with FIR

Report a separate error when class files compiled with FIR are in
dependencies, in addition to the one for class files compiled with FE
1.0 + JVM IR.

 #KT-43592

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java

@@ -119,6 +119,7 @@ public interface Errors {
     DiagnosticFactory1<PsiElement, String> MISSING_SCRIPT_PROVIDED_PROPERTY_CLASS = DiagnosticFactory1.create(ERROR);
     DiagnosticFactory1<PsiElement, String> PRE_RELEASE_CLASS = DiagnosticFactory1.create(ERROR);
     DiagnosticFactory1<PsiElement, String> IR_COMPILED_CLASS = DiagnosticFactory1.create(ERROR);
+    DiagnosticFactory1<PsiElement, String> FIR_COMPILED_CLASS = DiagnosticFactory1.create(ERROR);
     DiagnosticFactory2<PsiElement, String, IncompatibleVersionErrorData<?>> INCOMPATIBLE_CLASS = DiagnosticFactory2.create(ERROR);
 
     //Elements with "INVISIBLE_REFERENCE" error are marked as unresolved, unlike elements with "INVISIBLE_MEMBER" error

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java

@@ -402,6 +402,7 @@ public class DefaultErrorMessages {
         MAP.put(MISSING_SCRIPT_PROVIDED_PROPERTY_CLASS, "Cannot access script provided property class ''{0}''. Check your module classpath for missing or conflicting dependencies", TO_STRING);
         MAP.put(PRE_RELEASE_CLASS, "{0} is compiled by a pre-release version of Kotlin and cannot be loaded by this version of the compiler", TO_STRING);
         MAP.put(IR_COMPILED_CLASS, "{0} is compiled by a new Kotlin compiler backend and cannot be loaded by the old compiler", TO_STRING);
+        MAP.put(FIR_COMPILED_CLASS, "{0} is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler", TO_STRING);
         MAP.put(INCOMPATIBLE_CLASS,
                 "{0} was compiled with an incompatible version of Kotlin. {1}",
                 TO_STRING,

compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/MissingDependencyClassChecker.kt

@@ -59,6 +59,9 @@ object MissingDependencyClassChecker : CallChecker {
             if (source.isPreReleaseInvisible) {
                 return PRE_RELEASE_CLASS.on(reportOn, source.presentableString)
             }
+            if (source.abiStability == DeserializedContainerAbiStability.FIR_UNSTABLE) {
+                return FIR_COMPILED_CLASS.on(reportOn, source.presentableString)
+            }
             if (source.abiStability == DeserializedContainerAbiStability.IR_UNSTABLE) {
                 return IR_COMPILED_CLASS.on(reportOn, source.presentableString)
             }