RFR: 8278937: JCK test for java_awt/geom/Line2D.Float fails after 8277868

[Phil Race]

This reverts the uses of Float.compare() and Double.compare() made by the fix for 8277868
since it appears clear that for better or worse they are not 100% compatible with the previous code.
These uses are all in the desktop module

For comparison the original changes are here : https://github.com/openjdk/jdk/pull/6575/files

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Commit messages:
 - 8278937: JCK test for java_awt/geom/Line2D.Float fails after 8277868
 - 8278937: JCK test for java_awt/geom/Line2D.Float fails after 8277868

Changes: https://git.openjdk.java.net/jdk/pull/6875/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6875&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278937
  Stats: 20 lines in 3 files changed: 17 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6875.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6875/head:pull/6875

PR: https://git.openjdk.java.net/jdk/pull/6875