i965: Remove swizzling of assignment to vector-splitting single-channel LHS.
We'd end up reading some non-x component of the float RHS. +53 piglits.
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@ -319,8 +319,6 @@ ir_vector_splitting_visitor::visit_leave(ir_assignment *ir)
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ir->write_mask = (1 << 0);
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handle_rvalue(&ir->rhs);
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ir->rhs = new(mem_ctx) ir_swizzle(ir->rhs,
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elem, elem, elem, elem, 1);
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} else {
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handle_rvalue(&ir->rhs);
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}
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