[foreign-abi] [Rev 02] RFR: 8241148: need a way to create MemorySegment with contents from java String and a way to read a C char* as java String

[Athijegannathan Sundararajan]

> Adding utility methods to ForeignUnsafe class.

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

  Improved Test8241148 to check all System env. vars.

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Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/55/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/55/files/f7843a08..5d5a92e6

Webrevs:
 - full: https://webrevs.openjdk.java.net/panama-foreign/55/webrev.02
 - incr: https://webrevs.openjdk.java.net/panama-foreign/55/webrev.01-02

  Stats: 9 lines in 1 file changed: 0 ins; 2 del; 7 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/55.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/55/head:pull/55

PR: https://git.openjdk.java.net/panama-foreign/pull/55