[aarch64-port-dev ] RFR: AARCH64: The fix for hotspot's TestStable* tests

[Alexeev, Alexander]

Hello

This is porting of the fix for the series of tests from  http://hg.openjdk.java.net/aarch64-port/jdk8/ to http://hg.openjdk.java.net/jdk9/dev

The patch [1] corrects approach for method's compilation level determination with aarch64 specifics. Detailed description is provided as comments in the patch.

Could somebody proceed with this? Review and sponsor if approved.

Affected tests:
compiler/stable/TestStableByte.java
compiler/stable/TestStableBoolean.java
compiler/stable/TestStableChar.java
compiler/stable/TestStableFloat.java
compiler/stable/TestStableObject.java
compiler/stable/TestStableDouble.java
compiler/stable/TestStableInt.java
compiler/stable/TestStableLong.java
compiler/stable/TestStableShort.java

Before:
Test results: passed: 817; failed: 35; error: 3
After:
Test results: passed: 827; failed: 25; error: 3

[1] https://7013ccc350c4a4c1674f506214b6b6107b9d0df1.googledrive.com/host/0B5VQvD5uJjDQfnhPRnBzWE5uNFpoM3NmRFZUQ0hmSl9venRMeWNJVUtoaklXWm9lOFZ5eHc/