Use fast .class file reading implementation in boxAgainstJava tests

Since these tests compile Kotlin code against compiled Java code, it's
only reasonable to use the same .class file reading implementation as is
used in production for the same purpose

compiler/tests-common/tests/org/jetbrains/kotlin/codegen/AbstractBlackBoxAgainstJavaCodegenTest.kt

@@ -18,6 +18,7 @@ package org.jetbrains.kotlin.codegen
 
 import org.jetbrains.kotlin.cli.jvm.config.addJvmClasspathRoot
 import org.jetbrains.kotlin.config.CompilerConfiguration
+import org.jetbrains.kotlin.config.JVMConfigurationKeys
 import org.jetbrains.kotlin.test.ConfigurationKind
 import java.io.File
 
@@ -32,6 +33,7 @@ abstract class AbstractBlackBoxAgainstJavaCodegenTest : AbstractBlackBoxCodegenT
 
     override fun updateConfiguration(configuration: CompilerConfiguration) {
         configuration.addJvmClasspathRoot(javaClassesOutputDirectory)
+        configuration.put(JVMConfigurationKeys.USE_FAST_CLASS_FILES_READING, true)
     }
 
     override fun extractConfigurationKind(files: MutableList<TestFile>): ConfigurationKind {