8054993: type info cache may be disabled for test262 and tests explicitly changing that property should use @fork

Reviewed-by: lagergren, hannesw

nashorn/make/build.xml

@@ -519,6 +519,8 @@ grant codeBase "file:/${basedir}/test/script/markdown.js" {
     <java classname="${parallel.test.runner}" dir="${basedir}" fork="true">
       <jvmarg line="${ext.class.path}"/>
       <jvmarg line="${run.test.jvmargs} -Xmx${run.test.xmx} ${run.test.jvmsecurityargs} -Dbuild.dir=${build.dir}"/>
+      <!-- avoid too many typeinfo cache files. Each script is run only once anyway -->
+      <jvmarg line="-Dnashorn.typeInfo.disabled=true"/>
       <classpath>
           <pathelement path="${run.test.classpath}"/>
       </classpath>

nashorn/test/script/basic/compile-octane-normal.js

@@ -29,6 +29,7 @@
  * forever, so make this test future safe, we specify them explicitly
  *
  * @test
+ * @fork
  * @runif external.octane
  * @option -scripting
  * @option -Dnashorn.typeInfo.disabled=true

nashorn/test/script/basic/compile-octane-splitter.js

@@ -29,6 +29,7 @@
  * forever, so make this test future safe, we specify them explicitly
  *
  * @test
+ * @fork
  * @option -Dnashorn.compiler.splitter.threshold=1000
  * @fork
  * @runif external.octane