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.
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.