request(S): 7066339: Tiered: policy should make consistent decisions about osr levels

[Igor Veresov]

After my fix for 7058689 it is possible that the AdvancedThresholdPolicy 
will make a different decision as to what compilation level for osr is 
appropriate in loop_event() and call_event() from what happens in 
method_back_branch_event(). In method_back_branch_event() in case the 
OSR compilation level is CompLevel_limited_profile we change it to 
CompLevel_full_profile but we don't do the same in call_event() and 
loop_event() to determine whether the existing OSR methods are current. 
The solution would be to move this level fixup in form of disabling the 
tier 3 delay feedback in common() for OSRs.

There was also bad interaction between the in-queue level change 
optimization with TieredStopAtLevel option set to 3, which caused 
compilation loops between level 2 and 3. Now it will be disabled if 
TieredStopAtLevel < 4.

Also moved handling of TieredStopAtLevel to common(), because when it 
was in compile() it could lead to unnecessary OSR compiles with 
TieredStopAtLevel < 4.

Webrev: http://cr.openjdk.java.net/~iveresov/7066339/webrev.00/

Thanks,
igor