[foreign-jextract] [Rev 02] 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:
 - 55effa95: added typedef support for duplicate declaration detection.

Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/37/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/37/files/a87c74eb..55effa95

Webrevs:
 - full: https://webrevs.openjdk.java.net/panama-foreign/37/webrev.02
 - incr: https://webrevs.openjdk.java.net/panama-foreign/37/webrev.01-02

  Stats: 76 lines in 4 files changed: 63 ins; 0 del; 13 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