Align `double` and `float` decimal conversions in `java.util.Formatter` with the algorithm used in `Double.toString(double)`.
------------- Commit messages: - 8300869: Make use of the Double.toString(double) algorithm in java.util.Formatter Changes: https://git.openjdk.org/jdk/pull/12259/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12259&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8300869 Stats: 720 lines in 4 files changed: 319 ins; 372 del; 29 mod Patch: https://git.openjdk.org/jdk/pull/12259.diff Fetch: git fetch https://git.openjdk.org/jdk pull/12259/head:pull/12259 PR: https://git.openjdk.org/jdk/pull/12259
