RFR(M): 8067651: Fix Trivial code path for LevelTransitionTest.java

[Evgeny Nikitin]

Hi,

Bug: https://bugs.openjdk.java.net/browse/JDK-8067651
Webrev: https://cr.openjdk.java.net/~enikitin/8067651/webrev.00/

Adjusting the test to current state of the VM.

     - Definition of 'trivial code' does not depend on whether the 
method has been profiled or not;
     - Trivial code does only go level 0 to level 1;
     - Some refactoring.

The change has been checked in mach5 for the 5 platforms (passed).

Please review,
/Evgeny Nikitin.