RFR: 8341381: Random lines appear in graphic causing by the fix of JDK-8297230

[Laurent Bourgès]

- Fix cubic offsetting artefacts (sort cubic roots + fixed numerical accuracy problem in ROC^2-w^2 = 0 solver + fixed EliminateInf)
- Restored lower precision using ulp(float) in point, line or flat bezier curve checks

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Commit messages:
 - JDK-8341381 Random lines appear in graphic causing by the fix of JDK-8297230

Changes: https://git.openjdk.org/jdk/pull/27641/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27641&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341381
  Stats: 657 lines in 5 files changed: 620 ins; 1 del; 36 mod
  Patch: https://git.openjdk.org/jdk/pull/27641.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27641/head:pull/27641

PR: https://git.openjdk.org/jdk/pull/27641