gl-1.1: Add a new test for large vertex counts.
There's a limitation on VC4 where it can only handle 65536 verts at a time in a glDrawArrays(), so the driver needs to split up the calls. This tests that path for all the primitive types.
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There's a limitation on VC4 where it can only handle 65536 verts at a time in a glDrawArrays(), so the driver needs to split up the calls. This tests that path for all the primitive types.