Hat performance minimize buffer copy tweaking

[grfrost]

Buffer marking seems to work

Get perf improvement on game of life (x2.5) mandel (x0.25 ish) and suprisingly on violajones.

To compare with and without use env vars

HAT=GPU,MINIMIZE_COPIES java @bldr/hatrun ffi-opencl life

vs

HAT=GPU java @bldr/hatrun ffi-opencl life

---

Progress

• Change must not contain extraneous whitespace

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/babylon.git pull/348/head:pull/348
$ git checkout pull/348

Update a local copy of the PR:
$ git checkout pull/348
$ git pull https://git.openjdk.org/babylon.git pull/348/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 348

View PR using the GUI difftool:
$ git pr show -t 348

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/babylon/pull/348.diff

[grfrost]

/integrate

[bridgekeeper]

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[openjdk]

@grfrost This change now passes all automated pre-integration checks.

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Hat performance minimize buffer copy tweaking

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[openjdk]

Going to push as commit 73274d5.

[openjdk]

@grfrost Pushed as commit 73274d5.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

[mlbridge]

Webrevs

• 00: Full (0c8934da)