RFR: 8293691: converting a defined BasicType value to a string should not crash the VM

[Johan Sjölen]

Hi,

This implements Kim's suggested fix for this ticket.

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Commit messages:
 - Change impl of type2name

Changes: https://git.openjdk.org/jdk/pull/10447/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10447&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293691
  Stats: 15 lines in 2 files changed: 11 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10447.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10447/head:pull/10447

PR: https://git.openjdk.org/jdk/pull/10447