RFR: 8300869: Make use of the Double.toString(double) algorithm in java.util.Formatter [v6]

[Raffaello Giulietti]

> Align `double` and `float` decimal conversions in `java.util.Formatter` with the algorithm used in `Double.toString(double)`.

Raffaello Giulietti has updated the pull request incrementally with one additional commit since the last revision:

  8300869: Make use of the Double.toString(double) algorithm in java.util.Formatter

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12259/files
  - new: https://git.openjdk.org/jdk/pull/12259/files/0c72b743..bfe3d155

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12259&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12259&range=04-05

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 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