[jdk17u-dev] RFR: 8274527: Minimal VM build fails after JDK-8273459

[Scott Gibbons]

Second of 3 dependent backports for Base64 that are required to get the real bugfix cleanly integrated. The next one will be for  the buffer overrun bugfix required for Base64 decoding to work properly.

Risk: I view the risk of this backport to be minimal. This code has been in use for many months with no bugs reported.

Testing: x86_64 build, affected tests, tier1

Thanks,
--Scott

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Depends on: https://git.openjdk.org/jdk17u-dev/pull/862

Commit messages:
 - Backport cdd8743b217f9d6a2f814fe27ebfc544e343055e

Changes: https://git.openjdk.org/jdk17u-dev/pull/863/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=863&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8274527
  Stats: 22 lines in 4 files changed: 5 ins; 0 del; 17 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/863.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/863/head:pull/863

PR: https://git.openjdk.org/jdk17u-dev/pull/863