[code-reflection] Integrated: Hat fix java codebuilder

[Gary Frost]

Previous PR regressed java code builder.

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Commit messages:
 -  OpenCLHatKernelBuilder.java to OpenCLHATKernelBuilder.java
 - Fix NPE in java code builder

Changes: https://git.openjdk.org/babylon/pull/733/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=733&range=00
  Stats: 218 lines in 3 files changed: 1 ins; 215 del; 2 mod
  Patch: https://git.openjdk.org/babylon/pull/733.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/733/head:pull/733

PR: https://git.openjdk.org/babylon/pull/733