RFR: 8358130: [Metal] Merge shader compilation tasks

[Kevin Rushforth]

On Tue, 25 Nov 2025 14:44:24 GMT, Ambarish Rapte <arapte at openjdk.org> wrote:

> The `build.gradle` file contains separate tasks for compiling each standalone metal shader file.
> The 5 tasks are combined into a single task.
> 
> Verification:
> 1. Verify that build completes successfully, and the 5 **.metal** files are correctly compiled and 5 **.air** files are generated in directory : _modules/javafx.graphics/build/msl_
> `ClearRttShaders.air`,  `ComputeKernels.air`,  `PassThroughVS.air`,  `PhongPS.air`,  `PhongVS.air`
> 3. Basic sanity testing

The build changes look good. I confirm that the output produced by this change is identical to the current master.

This is simple enough that one reviewer should be enough, but if @jayathirthrao wants to take a quick look, that might be helpful.

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Marked as reviewed by kcr (Lead).

PR Review: https://git.openjdk.org/jfx/pull/1984#pullrequestreview-3513063175