RFR: JDK-6361826: (reflect) provide method for mapping strings to class object for primitive types [v3]

[Joe Darcy]

> Going over some old issues and found this RFE, posting without any tests or a CSR first to get some feedback on the overall API.

Joe Darcy has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - Use new API in serialization; add tests.
 - Merge branch 'master' into JDK-6361826
 - Update API proposal.
 - Merge branch 'master' into JDK-6361826
 - JDK-6361826: (reflect) provide method for mapping strings to class object for primitive types

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14743/files
  - new: https://git.openjdk.org/jdk/pull/14743/files/e16b4e90..a106b12c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14743&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14743&range=01-02

  Stats: 2270 lines in 105 files changed: 1508 ins; 592 del; 170 mod
  Patch: https://git.openjdk.org/jdk/pull/14743.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14743/head:pull/14743

PR: https://git.openjdk.org/jdk/pull/14743