RFR: 8262744: Formatter '%g' conversion uses wrong format for BigDecimal rounding up to limits [v2]

[Ian Graves]

> This fixes a bug where the formatting code for `%g` flags incorrectly tries to round `BigDecimal` after determining whether it should be a decimal numeric format or a scientific numeric format. The solution rounds before determining the correct format.

Ian Graves has updated the pull request incrementally with one additional commit since the last revision:

  Adding BigDecimal equivalents to tests

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3363/files
  - new: https://git.openjdk.java.net/jdk/pull/3363/files/8ec00f8f..cf40421e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3363&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3363&range=00-01

  Stats: 10 lines in 1 file changed: 5 ins; 1 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3363.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3363/head:pull/3363

PR: https://git.openjdk.java.net/jdk/pull/3363