RFR: 8157831: JVMCI tests should not be executed on linux-arm32

[Leonid Mesnik]

Hi

Could you please review following fix:
root http://cr.openjdk.java.net/~lmesnik/8157831/webrev.00/root/ 
<http://cr.openjdk.java.net/%7Elmesnik/8157831/webrev.00/root/>
hotspot http://cr.openjdk.java.net/~lmesnik/8157831/webrev.00/hotspot/ 
<http://cr.openjdk.java.net/%7Elmesnik/8157831/webrev.00/hotspot/>
for bug
https://bugs.openjdk.java.net/browse/JDK-8157831 
<https://bugs.openjdk.java.net/browse/JDK-8157831>

The property "os.name" which was used to filter tests depends on the 
arch of jdk which is used to run jtreg. It might differ from arch of 
tested jdk.
This fix introduce new property "vm.arch" which depends on the arch of 
tested jdk and could be used to filter tests with @requires.

I verified that tests are filtered where it is expected.
Note: I am going to push this fix in jdk9/hs to fix regular hotspot testing.

Leonid