RFR: 4511638: Double.toString(double) sometimes produces incorrect results [v7]

[Raffaello Giulietti]

> Hello,
> 
> here's a PR for a patch submitted on March 2020 [1](https://cr.openjdk.java.net/~bpb/4511638/webrev.04/) when Mercurial was a thing.
> 
> The patch has been edited to adhere to OpenJDK code conventions about multi-line (block) comments. Nothing in the code proper has changed, except for the addition of redundant but clarifying parentheses in some expressions.
> 
> 
> Greetings
> Raffaello

Raffaello Giulietti has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 13 commits:

 - 4511638: Double.toString(double) sometimes produces incorrect results
   
   Merge branch 'master' into JDK-4511638
 - 4511638: Double.toString(double) sometimes produces incorrect results
   
   Adapted hashes in ElementStructureTest.java
 - 4511638: Double.toString(double) sometimes produces incorrect results
   
   Merge branch 'master' into JDK-4511638
 - 4511638: Double.toString(double) sometimes produces incorrect results
   
   Enhanced intervals in MathUtils.
   Updated references to Schubfach v4.
 - 4511638: Double.toString(double) sometimes produces incorrect results
   
   Merge branch 'master' into JDK-4511638
 - 4511638: Double.toString(double) sometimes produces incorrect results
   
   Slight adjustments to Javadoc as suggested in the JDK-8202555 (CSR) comments.
 - 4511638: Double.toString(double) sometimes produces incorrect results
   
   Adjusted hashes in test/langtools/tools/javac/sym/ElementStructureTest.java
 - 4511638: Double.toString(double) sometimes produces incorrect results
   
   Merge branch 'master' into JDK-4511638
 - 4511638: Double.toString(double) sometimes produces incorrect results
 - 4511638: Double.toString(double) sometimes produces incorrect results
   
   Refactored test classes to better match OpenJDK conventions.
   Added tests recommended by Guy Steele and Paul Zimmermann.
 - ... and 3 more: https://git.openjdk.java.net/jdk/compare/dd06cc63...a36ff8ac

-------------

Changes: https://git.openjdk.java.net/jdk/pull/3402/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3402&range=06
  Stats: 23938 lines in 16 files changed: 23809 ins; 54 del; 75 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3402.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3402/head:pull/3402

PR: https://git.openjdk.java.net/jdk/pull/3402