Rewrite Complex class as interface

This change allow ExceptionState to be both: State and Throwable

generators/interpreter/GenerateInterpreterMap.kt

@@ -40,7 +40,6 @@ fun generateMap(): String {
     p.println("package org.jetbrains.kotlin.ir.interpreter.builtins")
     p.println()
     p.println("import org.jetbrains.kotlin.ir.interpreter.IrInterpreter")
-    p.println("import org.jetbrains.kotlin.ir.interpreter.state.*")
     p.println()
     p.println("/** This file is generated by org.jetbrains.kotlin.backend.common.interpreter.builtins.GenerateBuiltInsMap.generateMap(). DO NOT MODIFY MANUALLY */")
     p.println()
@@ -138,10 +137,7 @@ private fun generateUnaryBody(unaryOperationsMap: Map<CallableDescriptor, Pair<S
         val methodName = "${function.name}"
         val parentheses = if (function is FunctionDescriptor) "()" else ""
         "    unaryOperation${parameters.first}(\"$methodName\", ${parameters.second}) { a -> a.$methodName$parentheses }"
-    } +
-            "    unaryOperation<Any?>(\"${irNullCheck.name}\", \"${irNullCheck.valueParameters.first().type.originalKotlinType}\") { a -> a!! },\n" +
-            "    unaryOperation<ExceptionState>(\"message\", \"Throwable\") { a -> a.getMessage() },\n" +
-            "    unaryOperation<ExceptionState>(\"cause\", \"Throwable\") { a -> a.getCause() }"
+    } + "    unaryOperation<Any?>(\"${irNullCheck.name}\", \"${irNullCheck.valueParameters.first().type.originalKotlinType}\") { a -> a!! }"
 }
 
 private fun generateBinaryBody(