RFR: 8265700: Regularize throws clauses in BigDecimal [v2]

[Joe Darcy]

> Some throws clauses in BigDecimal are uninformative and could be eliminated. A few explicit throws clauses for surprising exceptions could be added.
> 
> These are spec clarifications rather than spec changes.
> 
> Follow-up work to https://github.com/openjdk/jdk/pull/3189.

Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:

  Include constructors.

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3608/files
  - new: https://git.openjdk.java.net/jdk/pull/3608/files/676ea4c5..1829b08c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3608&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3608&range=00-01

  Stats: 22 lines in 1 file changed: 1 ins; 19 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3608.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3608/head:pull/3608

PR: https://git.openjdk.java.net/jdk/pull/3608