This PR adds support for layout conflict handling for vector operands. A
conflict for a vector operand occurs when a value consumed at a given
operand is not in the expected layout in the context of the consumer
(for example `vector.multi_reduction` op's source require a specific
layout inferred from its current result layout). To resolve this
conflict, we insert an `xegpu.convert_layout` right after the producer
(essentially duplicating the producer with expected layout) and use the
new value in the consumer.
84594d7539