[lworld] RFR: 8249396: JNI function IsSameObject should apply the substitutability test for inline types

[Frederic Parain]

Please review this patch which fix the implementation of the JNI function IsSameObject by performing a substitutability
test when two references to inline type instances are passed in argument.

Passed tests tiers 1 to 3 with Mach5.

Thank you,

Fred

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Commit messages:
 - dd newline at the end of line
 - Add substitutability semantic to JNI IsSameObject function

Changes: https://git.openjdk.java.net/valhalla/pull/108/files
 Webrev: https://webrevs.openjdk.java.net/valhalla/108/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8249396
  Stats: 157 lines in 4 files changed: 151 ins; 6 del; 0 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/108.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/108/head:pull/108

PR: https://git.openjdk.java.net/valhalla/pull/108