RFR: 8194143: remove unneeded casts in LocationImpl and MirrorImpl classes

[Egor Ushakov]

Hello,

Please review and push the fix.
This is a formal letter after the discussion on the alias.

Bug:https://bugs.openjdk.java.net/browse/JDK-8194143
Webrev:http://cr.openjdk.java.net/~avu/egor.ushakov/cast_fix/

-- 
Egor Ushakov
Software Developer
JetBrains
http://www.jetbrains.com
The Drive to Develop

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