RFR: 8286810: Use public [Double|Float].PRECISION fields in jdk.internal.math.[Double|Float]Consts

[Raffaello Giulietti]

Please review these simple changes in jdk.internal.math.[Double|Float]Consts

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Commit messages:
 - 8286810: Use public [Double|Float].PRECISION fields in jdk.internal.math.[Double|Float]Consts

Changes: https://git.openjdk.java.net/jdk/pull/8729/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8729&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8286810
  Stats: 37 lines in 2 files changed: 8 ins; 5 del; 24 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8729.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8729/head:pull/8729

PR: https://git.openjdk.java.net/jdk/pull/8729