RFR: JDK-6361826: (reflect) provide method for mapping strings to class object for primitive types [v4]

[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 incrementally with one additional commit since the last revision:

  Clarify docs based on review feedback.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14743/files
  - new: https://git.openjdk.org/jdk/pull/14743/files/a106b12c..8a16ec86

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14743&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14743&range=02-03

  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 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