RFR: JDK-8282798 java.lang.runtime.Carrier

[Jim Laskey]

We propose to provide a runtime anonymous carrier class object generator; java.lang.runtime.Carrier. This generator class is designed to share anonymous classes when shapes are similar. For example, if several clients require objects containing two integer fields, then Carrier will ensure that each client generates carrier objects using the same underlying anonymous class. 

See JBS for details.

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Commit messages:
 - Introduce java.lang.runtime.Carrier

Changes: https://git.openjdk.java.net/jdk/pull/7744/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7744&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282798
  Stats: 1085 lines in 2 files changed: 1085 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7744.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7744/head:pull/7744

PR: https://git.openjdk.java.net/jdk/pull/7744