Add Throwable class into interpreter builtins map

Methods of Throwable class doesn't have bodies using FIR, so they must
be handled as builtins

compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/builtins/IrBuiltInsMapGenerated.kt

@@ -165,6 +165,12 @@ internal fun interpretUnaryFunction(name: String, type: String, a: Any?): Any? {
             "String" -> return (a as String).length
             "CharSequence" -> return (a as CharSequence).length
         }
+        "cause" -> when (type) {
+            "Throwable" -> return (a as Throwable).cause
+        }
+        "message" -> when (type) {
+            "Throwable" -> return (a as Throwable).message
+        }
         "size" -> when (type) {
             "BooleanArray" -> return (a as BooleanArray).size
             "CharArray" -> return (a as CharArray).size

generators/interpreter/GenerateInterpreterMap.kt

@@ -186,7 +186,9 @@ private fun getOperationMap(argumentsCount: Int): MutableList<Operation> {
     val operationMap = mutableListOf<Operation>()
     val allPrimitiveTypes = PrimitiveType.values().map { builtIns.getBuiltInClassByFqName(it.typeFqName) }
     val arrays = PrimitiveType.values().map { builtIns.getPrimitiveArrayClassDescriptor(it) } + builtIns.array
-    val additionalBuiltIns = listOf(builtIns.string, builtIns.any, builtIns.charSequence, builtIns.number, builtIns.comparable)
+    val additionalBuiltIns = listOf(
+        builtIns.string, builtIns.any, builtIns.charSequence, builtIns.number, builtIns.comparable, builtIns.throwable
+    )
 
     fun CallableDescriptor.isFakeOverride(classDescriptor: ClassDescriptor): Boolean {
         val isPrimitive = KotlinBuiltIns.isPrimitiveClass(classDescriptor) || KotlinBuiltIns.isString(classDescriptor.defaultType)