RFR(XS) : 8138794 : [TESTBUG] ctw tests fail to compile after 8137056

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev/8138794/webrev.00/index.html
> 1 line changed: 0 ins; 0 del; 1 mod; 

Hi all,

could you please review this 1-line patch? it simply updates tests according to 8137056 which moved sun.misc.SharedSecrets to jdk.internal.misc package.

bug: https://bugs.openjdk.java.net/browse/JDK-8138794

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Thanks,
Igor