[jdk13u-dev] RFR: 6532025: GIF reader throws misleading exception with truncated images

[Ekaterina Vergizova]

I'd like to backport 6532025 to 13u for parity with 11u.
The patch applies cleanly.
Tested with tier1; new test fails without the patch, passes with it.

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Commit messages:
 - Backport bd78beae15a497329be279e8754cca0c6b2249eb

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/96/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=96&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-6532025
  Stats: 69 lines in 2 files changed: 68 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/96.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/96/head:pull/96

PR: https://git.openjdk.java.net/jdk13u-dev/pull/96