@require get system properties by JT_JAVA instead of testjdk

Test.java
/*
 * @test
 * @requires os.simpleArch == "x64"
 */
public class Test {
public static void main(String[] a) {throw new Error(); }
}

Run this test with 32bit testjdk (linux-i586) on a x64 Linux box, expect to got "no tests selected".
But with different JT_JAVA (32bit stable_jdk or 64bit), got different result.

With a 64bit JT_JAVA, test is run. This is not expected:
    $ $JT_JAVA -version
    java version "1.8.0"
    Java(TM) SE Runtime Environment (build 1.8.0-b132)
    Java HotSpot(TM) 64-Bit Server VM (build 25.0-b70, mixed mode)

    $JT_HOME/bin/jtreg -nr -v1 -jdk:jdk ws/Test.java
    FAILED: Test.java
    Test results: failed: 1

With a 32bit JT_JAVA, test is not run, just as expected:
    $ $JT_JAVA -version
    java version "1.8.0"
    Java(TM) SE Runtime Environment (build 1.8.0-b132)
    Java HotSpot(TM) Server VM (build 25.0-b70, mixed mode)

    $JT_HOME/bin/jtreg -nr -v1 -jdk:jdk ws/Test.java
    Test results: no tests selected

Please note that for above two runs, the only change is JT_JAVA. This should not change test result but it does.


$JT_HOME/bin/jtreg -version
jtreg, version 4.1 fcs b12