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

[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.

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Commit messages:
 - JDK-6361826: (reflect) provide method for mapping strings to class object for primitive types

Changes: https://git.openjdk.org/jdk/pull/14743/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14743&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-6361826
  Stats: 37 lines in 1 file changed: 37 ins; 0 del; 0 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