[WGSL] Buffer dynamic offsets are not implemented

[Mike Wyrzykowski]

[WGSL] Buffer dynamic offsets are not implemented

This offset would probably be in its own buffer because the pipeline doesn't know the value until right before draw time. 

So:
[[vertex]] type2 function0(type3 parameter0 [[stage_in]], constant type5& parameter1 [[buffer(22)]])
{
    const constant type4& local0 = parameter1.uniforms;

would become something like:

[[vertex]] type2 function0(type3 parameter0 [[stage_in]], constant type5& parameter1 [[buffer(22)]], constant uint32_t* offsets [[buffer(23)]])
{
    const constant type4& local0 = *(const constant type4*)((constant char*)&parameter1.uniforms + offsets[INDEX]));

where INDEX is 0,1,2... corresponding to the nth buffer in the bind group

[Radar WebKit Bug Importer]

<rdar://problem/116073820>

[Tadeu Zagallo]

Pull request: https://github.com/WebKit/WebKit/pull/18992

[EWS]

Committed 269418@main (7990584a04b5): <https://commits.webkit.org/269418@main>

Reviewed commits have been landed. Closing PR #18992 and removing active labels.