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shader: Don't emit 'precise' when 'invariant' is already given in declaration

Gert Wollny requested to merge gerddie/virglrenderer:fix-precise-invariant into master

It is not necessary to emit both statements, and on a GLES 3.1 host that doesn't support ARB_gpu_shader5 this actually breaks some shaders.

Fixes: 36c919e1 shader: rework precise-emitting for built-ins

Fixes on the softpipe host driver:

dEQP-GLES3.functional.shaders.qualification_order.variables. valid.invariant_interp_storage valid.invariant_interp_storage_precision valid.invariant_storage valid.invariant_storage_precision

Signed-off-by: Gert Wollny gert.wollny@collabora.com

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