8321820: TestLoadNIdeal fails on 32-bit because -XX:+UseCompressedOops is not recognized

Reviewed-by: rcastanedalo, chagedorn, shade

Author: dlunde

test/hotspot/jtreg/compiler/c2/irTests/igvn/TestLoadNIdeal.java

@@ -28,6 +28,7 @@
 /*
  * @test
  * @bug 8310524
+ * @requires vm.bits == 64
  * @summary Test that IGVN optimizes away one of two identical LoadNs.
  * @library /test/lib /
  * @run driver compiler.c2.irTests.igvn.TestLoadNIdeal