RFR 8240324: Improve is_boot_class_loader_data() by adding simple check

[Lois Foltan]

On 3/3/2020 10:46 AM, coleen.phillimore at oracle.com wrote:
> Looks good plus trivial.

+1.
Lois

> Thanks,
> Coleen
>
> On 3/3/20 10:33 AM, Harold Seigel wrote:
>> Hi,
>>
>> Please review this trivial fix for JDK-8240324 to potentially avoid 
>> accessing the class loader oop.
>>
>> Open Webrev: http://cr.openjdk.java.net/~hseigel/bug_8240324/webrev/
>>
>> JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8240324
>>
>> The fix was regression tested by running Mach5 tiers 1 and 2 tests 
>> and builds on Linux-x64, Solaris, Windows, and Mac OS X, by running 
>> Mach5 tiers 3-5 tests on Linux-x64, and JCK lang and VM tests on 
>> Linux-x64.
>>
>> Thanks, Harold
>>
>