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IBFE/UBFE/BFI vector handling

If a vector operation of these TGSI opcodes has a non-.xxxx swizzle, virglrenderer doesn't split it up into per-channel GLSL builtin calls (see the int() casts in vrend_shader.c's handling of these opcodes).

I'm working around this in NTT, but it seems like incorrect handling of TGSI.

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