RFR(XS) : 8021120 : TieredCompilation can be enabled even if TIERED is undefined

[Igor Ignatyev]

Hi all,

Please review patch.

Problem:
If 'COMPILER2' is defined, it will be possible to enable 
'TieredCompilation' even if 'TIERED' is undefined. But such VM will 
raise error at 'compilationPolicy_init'

Fix:
Forcibly set 'TieredCompilation' in false, if 'TIERED' is undefined.

webrev: http://cr.openjdk.java.net/~iignatyev/8021120/webrev.00/
jbs: https://jbs.oracle.com/bugs/browse/JDK-8021120
testing: jprt, 'java -version' on different VM (including embedded 
client, server, minimal)
-- 
Best regards,
Igor Ignatyev