[decompiler] fix ambiguities to builtin members resolve in K2 IDE

If a user has multiple kotlin-stdlib libraries in a project, all those stdlib libraries will contain builtins
which will result in resolution ambiguities.

To prevent such kind of ambiguities inside LLFirDependenciesSymbolProvider,
callables are grouped by facade class name.
Only matching callables from the first facade are used.

Facade is a Kotlin/JVM-term so right now it works only for JVM targets.
Builtins are also used in JVM, so the current solution is to have a Facade name also for builtins.

^KTIJ-26760

analysis/decompiled/decompiler-to-psi/src/org/jetbrains/kotlin/analysis/decompiler/psi/KotlinBuiltInDecompiler.kt

@@ -6,10 +6,14 @@ import com.intellij.ide.highlighter.JavaClassFileType
 import com.intellij.openapi.vfs.VirtualFile
 import org.jetbrains.annotations.TestOnly
 import org.jetbrains.kotlin.analysis.decompiler.stub.file.KotlinMetadataStubBuilder
+import org.jetbrains.kotlin.descriptors.SourceElement
+import org.jetbrains.kotlin.load.kotlin.JvmPackagePartSource
+import org.jetbrains.kotlin.load.kotlin.PackagePartClassUtils
 import org.jetbrains.kotlin.metadata.ProtoBuf
 import org.jetbrains.kotlin.metadata.builtins.BuiltInsBinaryVersion
 import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.psi.stubs.KotlinStubVersions
+import org.jetbrains.kotlin.resolve.jvm.JvmClassName
 import org.jetbrains.kotlin.serialization.deserialization.FlexibleTypeDeserializer
 import org.jetbrains.kotlin.serialization.deserialization.MetadataPackageFragment
 import org.jetbrains.kotlin.serialization.deserialization.builtins.BuiltInSerializerProtocol
@@ -21,16 +25,34 @@ class KotlinBuiltInDecompiler : KotlinMetadataDecompiler<BuiltInsBinaryVersion>(
     FlexibleTypeDeserializer.ThrowException, { BuiltInsBinaryVersion.INSTANCE }, { BuiltInsBinaryVersion.INVALID_VERSION },
     KotlinStubVersions.BUILTIN_STUB_VERSION
 ) {
+    override val metadataStubBuilder: KotlinMetadataStubBuilder =
+        KotlinBuiltInMetadataStubBuilder(::readFileSafely)
+
     override fun readFile(bytes: ByteArray, file: VirtualFile): KotlinMetadataStubBuilder.FileWithMetadata? {
         return BuiltInDefinitionFile.read(bytes, file)
     }
 }
 
+private class KotlinBuiltInMetadataStubBuilder(
+    readFile: (VirtualFile, ByteArray) -> FileWithMetadata?,
+) : KotlinMetadataStubBuilder(KotlinStubVersions.BUILTIN_STUB_VERSION, KotlinBuiltInFileType, { BuiltInSerializerProtocol }, readFile) {
+    override fun createCallableSource(file: FileWithMetadata.Compatible, filename: String): SourceElement? {
+        val fileNameForFacade = when (val withoutExtension = filename.removeSuffix(BuiltInSerializerProtocol.DOT_DEFAULT_EXTENSION)) {
+            // this is the filename used in stdlib, others should match
+            "kotlin" -> "library"
+            else -> withoutExtension
+        }
+
+        val facadeFqName = PackagePartClassUtils.getPackagePartFqName(file.packageFqName, fileNameForFacade)
+        return JvmPackagePartSource(JvmClassName.byClassId(ClassId.topLevel(facadeFqName)), null, file.proto.`package`, file.nameResolver)
+    }
+}
+
 class BuiltInDefinitionFile(
     proto: ProtoBuf.PackageFragment,
     version: BuiltInsBinaryVersion,
     val packageDirectory: VirtualFile,
-    val isMetadata: Boolean
+    val isMetadata: Boolean,
 ) : KotlinMetadataStubBuilder.FileWithMetadata.Compatible(proto, version, BuiltInSerializerProtocol) {
     override val classesToDecompile: List<ProtoBuf.Class>
         get() = super.classesToDecompile.let { classes ->

analysis/decompiled/decompiler-to-psi/src/org/jetbrains/kotlin/analysis/decompiler/psi/KotlinMetadataDecompiler.kt

@@ -31,7 +31,7 @@ abstract class KotlinMetadataDecompiler<out V : BinaryVersion>(
     private val invalidBinaryVersion: () -> V,
     stubVersion: Int
 ) : ClassFileDecompilers.Full() {
-    private val metadataStubBuilder: KotlinMetadataStubBuilder =
+    protected open val metadataStubBuilder: KotlinMetadataStubBuilder =
         KotlinMetadataStubBuilder(stubVersion, fileType, serializerProtocol, ::readFileSafely)
 
     private val renderer: DescriptorRenderer by lazy {
@@ -61,7 +61,7 @@ abstract class KotlinMetadataDecompiler<out V : BinaryVersion>(
     @TestOnly
     fun readFile(file: VirtualFile) = readFileSafely(file)
 
-    private fun readFileSafely(file: VirtualFile, content: ByteArray? = null): KotlinMetadataStubBuilder.FileWithMetadata? {
+    protected fun readFileSafely(file: VirtualFile, content: ByteArray? = null): KotlinMetadataStubBuilder.FileWithMetadata? {
         if (!file.isValid) return null
 
         return try {