[foreign-abi] RFR: 8248421: CSupport should have a way to free memory allocated outside Java [v2]

[Athijegannathan Sundararajan]

> Added CSupport.freeMemoryRestricted utility method.

Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last
revision:

  added CSupport.allocateMemoryRestricted

-------------

Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/281/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/281/files/097bc6a2..e64b7d2e

Webrevs:
 - full: https://webrevs.openjdk.java.net/panama-foreign/281/webrev.01
 - incr: https://webrevs.openjdk.java.net/panama-foreign/281/webrev.00-01

  Stats: 39 lines in 3 files changed: 24 ins; 10 del; 5 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/281.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/281/head:pull/281

PR: https://git.openjdk.java.net/panama-foreign/pull/281