RFR: 8289260: BigDecimal movePointLeft() and movePointRight() do not follow their API spec [v2]

[Raffaello Giulietti]

> `BigDecimal.morePoint[Left|Right]()` should return the target `this` when the argument is 0 _and_ the scale is non-negative.

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

  8289260: BigDecimal movePointLeft() and movePointRight() do not follow their API spec

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9307/files
  - new: https://git.openjdk.org/jdk/pull/9307/files/02b28330..9755bb12

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9307&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9307&range=00-01

  Stats: 33 lines in 1 file changed: 32 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9307.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9307/head:pull/9307

PR: https://git.openjdk.org/jdk/pull/9307