[code-reflection] Integrated: Hat opencl cuda mergees

[Gary Frost]

Multiple cuda/openl fixes across multiple platforms. 

Mostly tidying allocation of Buffers and fixing up C style casts to static/reinterpret/dynamic

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Commit messages:
 - rationalize casting
 - ubuntu crashed

Changes: https://git.openjdk.org/babylon/pull/92/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=92&range=00
  Stats: 409 lines in 5 files changed: 190 ins; 114 del; 105 mod
  Patch: https://git.openjdk.org/babylon/pull/92.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/92/head:pull/92

PR: https://git.openjdk.org/babylon/pull/92