[foreign-jextract] [Rev 01] RFR: 8240300: jextract produces non compilable code with repeated declarations

[Athijegannathan Sundararajan]

> Filtering repeated global variables and functions in code generator (added necessary hashCode, equals for decls, types)

The pull request has been updated with 1 additional commit.

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Added commits:
 - a87c74eb: * added hashCode, equals to Type and Declaration

Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/37/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/37/files/f1720cf0..a87c74eb

Webrevs:
 - full: https://webrevs.openjdk.java.net/panama-foreign/37/webrev.01
 - incr: https://webrevs.openjdk.java.net/panama-foreign/37/webrev.00-01

  Stats: 164 lines in 8 files changed: 95 ins; 22 del; 47 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/37.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/37/head:pull/37

PR: https://git.openjdk.java.net/panama-foreign/pull/37