[LL] Use package provider to check for existing package

KT-59793

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

@@ -17,7 +17,6 @@ import com.intellij.psi.PsiManager
 import com.intellij.psi.SingleRootFileViewProvider
 import com.intellij.psi.search.GlobalSearchScope
 import com.intellij.psi.stubs.StubElement
-import com.intellij.util.containers.CollectionFactory.createConcurrentWeakValueMap
 import com.intellij.util.indexing.FileContent
 import com.intellij.util.indexing.FileContentImpl
 import com.intellij.util.io.URLUtil
@@ -135,6 +134,7 @@ public class KotlinStaticDeclarationProviderFactory(
 
     private val psiManager = PsiManager.getInstance(project)
     private val builtInDecompiler = KotlinBuiltInDecompiler()
+    private val createdFakeKtFiles = mutableListOf<KtFile>()
 
     private fun loadBuiltIns(): Collection<KotlinFileStubImpl> {
         val classLoader = this::class.java.classLoader
@@ -170,6 +170,7 @@ public class KotlinStaticDeclarationProviderFactory(
             override fun isPhysical() = false
         }
         ktFileStub.psi = fakeFile
+        createdFakeKtFiles.add(fakeFile)
         return ktFileStub
     }
 
@@ -343,6 +344,7 @@ public class KotlinStaticDeclarationProviderFactory(
                     override fun isPhysical() = false
                 }
                 stub.psi = fakeFile
+                createdFakeKtFiles.add(fakeFile)
                 processStub(stub)
             }
         }
@@ -356,6 +358,10 @@ public class KotlinStaticDeclarationProviderFactory(
     override fun createDeclarationProvider(scope: GlobalSearchScope, contextualModule: KtModule?): KotlinDeclarationProvider {
         return KotlinStaticDeclarationProvider(index, scope)
     }
+
+    public fun getAdditionalCreatedKtFiles(): List<KtFile> {
+        return createdFakeKtFiles
+    }
 }
 
 /**