RFR : 8156124: Update compiler/unsafe/UnsafeGetConstantField after JDK-8148518 is fixed

[Jamsheed C m]

Hi,

Request for review a trivial change.

bug id : https://bugs.openjdk.java.net/browse/JDK-8156124
webrev: http://cr.openjdk.java.net/~jcm/8156124/webrev.00/

As JDK-8148518 <https://bugs.openjdk.java.net/browse/JDK-8148518>  is 
fixed removing the checks/workaround.

PIT result  link is available in bug report.

Best Regards,
Jamsheed

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