RFR: 8280166: Extend java/lang/instrument/GetObjectSizeIntrinsicsTest.java test cases

[Aleksey Shipilev]

While working on JDK-8280003, I noticed that java/lang/instrument/GetObjectSizeIntrinsicsTest.java does not test arrays with more than 1-byte size elements, and no large arrays (past 4G limit) are tested either. It would be better to add those test cases. 

Additional testing:
 - [x] Linux x86_64 fastdebug, affected test still passes
 - [x] Linux x86_32 fastdebug, affected test still passes
 - [ ] Linux AArch64 fastdebug, affected test still passes
 - [ ] Linux PPC64 fastdebug, affected test still passes

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Commit messages:
 - Fix

Changes: https://git.openjdk.java.net/jdk/pull/7132/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7132&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280166
  Stats: 88 lines in 1 file changed: 62 ins; 0 del; 26 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7132.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7132/head:pull/7132

PR: https://git.openjdk.java.net/jdk/pull/7132