Kotlin: Add 1.5.21 specific files

java/kotlin-extractor/src/main/kotlin/utils/versions/v_1_5_21/Descriptors.kt

@@ -0,0 +1,18 @@
+package com.github.codeql.utils.versions
+
+import com.github.codeql.KotlinUsesExtractor
+import com.github.codeql.Severity
+import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
+import org.jetbrains.kotlin.ir.util.DeclarationStubGenerator
+import org.jetbrains.kotlin.ir.util.SymbolTable
+import org.jetbrains.kotlin.psi2ir.generators.DeclarationStubGeneratorImpl
+
+@OptIn(ObsoleteDescriptorBasedAPI::class)
+fun <TIrStub> KotlinUsesExtractor.getIrStubFromDescriptor(generateStub: (DeclarationStubGenerator) -> TIrStub) : TIrStub? =
+    (pluginContext.symbolTable as? SymbolTable) ?.let {
+        val stubGenerator = DeclarationStubGeneratorImpl(pluginContext.moduleDescriptor, it, pluginContext.languageVersionSettings)
+        generateStub(stubGenerator)
+    } ?: run {
+        logger.error("Plugin context has no symbol table, couldn't get IR stub")
+        null
+    }

java/kotlin-extractor/src/main/kotlin/utils/versions/v_1_5_21/FileEntry.kt

@@ -0,0 +1,5 @@
+package com.github.codeql.utils.versions
+
+import org.jetbrains.kotlin.ir.IrFileEntry
+
+typealias FileEntry = IrFileEntry

java/kotlin-extractor/src/main/kotlin/utils/versions/v_1_5_21/Functions.kt

@@ -0,0 +1,8 @@
+package com.github.codeql.utils.versions
+
+import org.jetbrains.kotlin.backend.common.extensions.IrPluginContext
+import org.jetbrains.kotlin.ir.declarations.IrClass
+
+fun functionN(pluginContext: IrPluginContext): (Int) -> IrClass {
+    return { i -> pluginContext.irBuiltIns.functionFactory.functionN(i) }
+}

java/kotlin-extractor/src/main/kotlin/utils/versions/v_1_5_21/Psi2Ir.kt

@@ -0,0 +1,18 @@
+package com.github.codeql.utils.versions
+
+import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.backend.common.psi.PsiSourceManager
+import org.jetbrains.kotlin.backend.jvm.ir.getKtFile
+import org.jetbrains.kotlin.ir.IrElement
+import org.jetbrains.kotlin.ir.declarations.IrFile
+import org.jetbrains.kotlin.psi.KtFile
+
+class Psi2Ir: Psi2IrFacade {
+    override fun getKtFile(irFile: IrFile): KtFile? {
+        return irFile.getKtFile()
+    }
+
+    override fun findPsiElement(irElement: IrElement, irFile: IrFile): PsiElement? {
+        return PsiSourceManager.findPsiElement(irElement, irFile)
+    }
+}

java/kotlin-extractor/src/main/kotlin/utils/versions/v_1_5_21/Types.kt

@@ -0,0 +1,7 @@
+package com.github.codeql.utils.versions
+
+import org.jetbrains.kotlin.backend.jvm.codegen.isRawType
+import org.jetbrains.kotlin.ir.types.IrSimpleType
+
+
+fun IrSimpleType.isRawType() = this.isRawType()