RFR: JDK-8287838: Update Float and Double to use snippets [v2]

[Joe Darcy]

> Various code blocks in Float and Double would be better as snippets.

Joe Darcy has updated the pull request incrementally with two additional commits since the last revision:

 - Use idiom for shorter lines
 - Respond to review feedback.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/9034/files
  - new: https://git.openjdk.java.net/jdk/pull/9034/files/255fbb15..56abd0ac

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=9034&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=9034&range=00-01

  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/9034.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/9034/head:pull/9034

PR: https://git.openjdk.java.net/jdk/pull/9034