RFR(S): 8012322 : Tiered: CompilationPolicy::can_be_compiled(CompLevel_all) mistakenly return false

[Igor Ignatyev]

Hi all,

Please review the patch.

Problem:
if method is 'not_compilable' in C1 or C2, 
'CompilationPolicy::can_be_compiled' will return false for 
'CompLevel_all' even it is compilable in another level

Fix:
1. added explicit comp_level to all calls of 
CompilationPolicy::can_be_compiled
2. in CompilationPolicy::can_be_compiled()
   - added assert for checking legality of comp_level
   - changed logic for comp_level == CompLevel_all

Testing:
JPRT 'compiler/whitebox'

webrev: http://cr.openjdk.java.net/~iignatyev/8012322/webrev.00/
jbs: https://jbs.oracle.com/bugs/browse/JDK-8012322
-- 
Best regards,
Igor Ignatyev