glamor: Avoid using GL_QUADS on VC4.
Improves text rendering from about 284k glyphs per second to 320k glyphs per second. There's no GL extension for probing this, because of the philosophy of "Don't expose whether things are really in hardware or not." Signed-off-by: Eric Anholt <firstname.lastname@example.org> Reviewed-by: Dave Airlie <email@example.com>
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