Adding shader long vector feature

[pingpongcat]

Adds support for requesting the shader long vector to be used
DEPS update to alight witch v1.4.337

[dj2]

This looks good to me, need to see what the bots say. Is it possible to add an amber example script into the repo to show the functionality?

[pingpongcat]

Hi Dan, I prepared this pull request because I’m helping to get the new CTS tests for VK_EXT_shader_long_vector passing amber verification in our CI.

I upcoming CTS tests there already is an amber file that Jeff Bolz @jeffbolznv wrote for testing purposes:
(note: you need access to the Khronos repository)

https://gerrit.khronos.org/c/vk-gl-cts/+/18489/6/external/vulkancts/data/vulkan/amber/spirv_assembly/instruction/compute/vector_shuffle/long_vector_shuffle.amber

Does that count as an example? or after adding each new feature to amber you'll also like to have some kind of internal sample?

[dj2]

Having a small test file in the amber repo itself at least lets us know if we happen to break anything before it rolls into CTS, but I won't block this change on it. Once the bots are good, and you'll need to update on top of the change from yesterday, this should be good to go I think.

[dj2]

The failures seem like cmake failures with swiftshader? I wonder if one of the changed dependencies is causing cmake to work differently?

[pingpongcat]

Ok I think that updating swiftshader DEPS would do the trick

[dj2]

Thanks a lot for the CL. I'm ignoring the NDK build, I think it needs some work to get running so merged as is.