[14] RFR (XS): 8226409: Enable argument profiling for sun.misc.Unsafe.put*/get*

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8226409/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8226409

JDK-8181211 [1] enabled argument profiling for jdk.internal.misc.Unsafe 
to recuperate performance regression when off-heap/on-heap accesses are 
treated as mixed accesses (due to recent bug fixes in that area).

Profiling data allows to speculatively optimize for on-heap or off-heap 
scenario and avoid memory barriers around unsafe accesses which are 
mandatory in mixed case.

Unfortunately, it doesn't help sun.misc.Unsafe at all.

sun.misc.Unsafe delegates to jdk.internal.misc.Unsafe and profiling data 
is mostly useless there since it is almost always polluted.

Proposed fix is to enable argument profiling for sun.misc.Unsafe as well.

Testing: hs-precheckin-comp, tier1-4

Thanks!

Best regards,
Vladimir Ivanov

[1] https://bugs.openjdk.java.net/browse/JDK-8181211