[foreign-jextract] [Rev 02] RFR: 8241925: jextract should generate simple allocation, access API for C primitive types

[Athijegannathan Sundararajan]

> added static method helper classes to handle allocation, access ot C primitive types and C strings.

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

  * renamed Cstring.toString as Cstring.toJavaString
  * added toJavaArray for Cint, Cdouble etc.
  * alignment in panamd-jextract.md

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Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/78/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/78/files/4bbec8bd..7cf51998

Webrevs:
 - full: https://webrevs.openjdk.java.net/panama-foreign/78/webrev.02
 - incr: https://webrevs.openjdk.java.net/panama-foreign/78/webrev.01-02

  Stats: 27 lines in 5 files changed: 17 ins; 0 del; 10 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/78.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/78/head:pull/78

PR: https://git.openjdk.java.net/panama-foreign/pull/78