i965/fs: Drop the viewport index/rtai clearing in gen6 fb writes.
These fields are documented to be in the payload, and though the FB write docs say they *aren't* in the payload, for all other fields the payload and header is structured so that no overwriting is required except for non-default options.
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@ -2330,12 +2330,6 @@ fs_visitor::generate_fb_write(fs_inst *inst)
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brw_imm_ud(inst->target));
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}
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/* Clear viewport index, render target array index. */
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brw_AND(p, retype(brw_vec1_reg(BRW_MESSAGE_REGISTER_FILE, 0, 0),
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BRW_REGISTER_TYPE_UD),
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retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UD),
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brw_imm_ud(0xf7ff));
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implied_header = brw_null_reg();
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} else {
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implied_header = retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UW);
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