AA: do not use full decompilation for built-ins

This is the major performance bottleneck for AA/UAST artifacts rollout
to Android Lint. KT stubs are good/fast enough.

analysis/analysis-api-providers/src/org/jetbrains/kotlin/analysis/providers/impl/KotlinStaticDeclarationProvider.kt

@@ -6,20 +6,22 @@
 package org.jetbrains.kotlin.analysis.providers.impl
 
 import com.intellij.openapi.project.Project
+import com.intellij.openapi.vfs.VirtualFile
 import com.intellij.openapi.vfs.impl.jar.CoreJarFileSystem
 import com.intellij.psi.*
 import com.intellij.psi.search.GlobalSearchScope
+import com.intellij.psi.stubs.StubElement
 import com.intellij.util.indexing.FileContent
 import com.intellij.util.indexing.FileContentImpl
 import com.intellij.util.io.URLUtil
 import org.jetbrains.kotlin.analysis.decompiler.psi.KotlinBuiltInDecompiler
-import org.jetbrains.kotlin.analysis.decompiler.psi.KotlinDecompiledFileViewProvider
-import org.jetbrains.kotlin.analysis.decompiler.psi.file.KtDecompiledFile
 import org.jetbrains.kotlin.analysis.providers.KotlinDeclarationProvider
 import org.jetbrains.kotlin.analysis.providers.KotlinDeclarationProviderFactory
 import org.jetbrains.kotlin.fileClasses.javaFileFacadeFqName
+import org.jetbrains.kotlin.idea.KotlinLanguage
 import org.jetbrains.kotlin.name.*
 import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.psi.stubs.impl.*
 import org.jetbrains.kotlin.serialization.deserialization.builtins.BuiltInSerializerProtocol
 
 public class KotlinStaticDeclarationProvider internal constructor(
@@ -107,7 +109,7 @@ public class KotlinStaticDeclarationProviderFactory(
     private val psiManager = PsiManager.getInstance(project)
     private val builtInDecompiler = KotlinBuiltInDecompiler()
 
-    private fun loadBuiltIns(): Collection<KtDecompiledFile> {
+    private fun loadBuiltIns(): Collection<KotlinFileStubImpl> {
         val classLoader = this::class.java.classLoader
         return buildList {
             StandardClassIds.builtInsPackages.forEach { builtInPackageFqName ->
@@ -121,7 +123,7 @@ public class KotlinStaticDeclarationProviderFactory(
                         val pathToQuery = jarPath + URLUtil.JAR_SEPARATOR + builtInFile
                         jarFileSystem.findFileByPath(pathToQuery)?.let { vf ->
                             val fileContent = FileContentImpl.createByFile(vf, project)
-                            createKtFileStub(fileContent)?.let { file -> add(file) }
+                            createKtFileStub(psiManager, builtInDecompiler, fileContent)?.let { file -> add(file) }
                         }
                     }
                 }
@@ -130,18 +132,25 @@ public class KotlinStaticDeclarationProviderFactory(
     }
 
     private fun createKtFileStub(
+        psiManager: PsiManager,
+        builtInDecompiler: KotlinBuiltInDecompiler,
         fileContent: FileContent,
-    ): KtDecompiledFile? {
-        val fileViewProvider =
-            builtInDecompiler.createFileViewProvider(fileContent.file, psiManager, physical = true) as? KotlinDecompiledFileViewProvider
-                ?: return null
-        return builtInDecompiler.readFile(fileContent.content, fileContent.file)?.let { fileWithMetadata ->
-            KtDecompiledFile(fileViewProvider) {
-                builtInDecompiler.buildDecompiledText(fileWithMetadata)
-            }
+    ): KotlinFileStubImpl? {
+        val ktFileStub = builtInDecompiler.stubBuilder.buildFileStub(fileContent) as? KotlinFileStubImpl ?: return null
+        val fakeFile = object : KtFile(KtClassFileViewProvider(psiManager, fileContent.file), isCompiled = true) {
+            override fun getStub() = ktFileStub
+
+            override fun isPhysical() = false
         }
+        ktFileStub.psi = fakeFile
+        return ktFileStub
     }
 
+    private class KtClassFileViewProvider(
+        psiManager: PsiManager,
+        virtualFile: VirtualFile,
+    ) : SingleRootFileViewProvider(psiManager, virtualFile, true, KotlinLanguage.INSTANCE)
+
     private inner class KtDeclarationRecorder : KtVisitorVoid() {
 
         override fun visitElement(element: PsiElement) {
@@ -217,8 +226,23 @@ public class KotlinStaticDeclarationProviderFactory(
         val recorder = KtDeclarationRecorder()
 
         // Indexing built-ins
-        loadBuiltIns().forEach {
-            it.accept(recorder)
+        fun indexStub(stub: StubElement<*>) {
+            when (stub) {
+                is KotlinClassStubImpl -> {
+                    addToClassMap(stub.psi)
+                    // member functions and properties
+                    stub.childrenStubs.forEach(::indexStub)
+                }
+                is KotlinTypeAliasStubImpl -> addToTypeAliasMap(stub.psi)
+                is KotlinFunctionStubImpl -> addToFunctionMap(stub.psi)
+                is KotlinPropertyStubImpl -> addToPropertyMap(stub.psi)
+            }
+        }
+
+        loadBuiltIns().forEach { ktFileStub ->
+            addToFacadeFileMap(ktFileStub.psi)
+            // top-level functions and properties, built-in classes
+            ktFileStub.childrenStubs.forEach(::indexStub)
         }
 
         // Indexing user source files