RFR: 8258408: SystemDictionary passes TRAPS to functions that don't throw exceptions [v2]

[Coleen Phillimore]

> Please review some mostly superficial cleanups to the SystemDictionary code.  See issue for more details.
> 
> Tested with tier1-6.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Fix typo.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1808/files
  - new: https://git.openjdk.java.net/jdk/pull/1808/files/8452a352..0d9d6933

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1808&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1808&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1808.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1808/head:pull/1808

PR: https://git.openjdk.java.net/jdk/pull/1808