RFR: 8268124: Update java.lang to use switch expressions

[Patrick Concannon]

Hi,

Could someone please review my code for updating the code in the `java.lang` packages to make use of the switch expressions?

Kind regards,
Patrick

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Commit messages:
 - 8268124: Update java.lang to use switch expressions

Changes: https://git.openjdk.java.net/jdk/pull/4312/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4312&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268124
  Stats: 551 lines in 22 files changed: 7 ins; 140 del; 404 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4312.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4312/head:pull/4312

PR: https://git.openjdk.java.net/jdk/pull/4312