RFR: 8258896: Remove the JVM ForceFloatExceptions option

[Harold Seigel]

Please review this change to replace the JVM ForceFloatExceptions flag with #ifdef (_DEBUG).  The change was tested with tiers 1 and 2 on Linux, Windows, and Mac OS, and tiers 3-5 on Windows x64.

Thanks, Harold

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Commit messages:
 - 8258896: Remove the JVM ForceFloatExceptions option

Changes: https://git.openjdk.java.net/jdk/pull/1932/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1932&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258896
  Stats: 19 lines in 2 files changed: 0 ins; 5 del; 14 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1932.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1932/head:pull/1932

PR: https://git.openjdk.java.net/jdk/pull/1932