[SYCL-MLIR] Capture split arrays during raising (#10693)
The frontend sometimes splits an array into multiple parts to pass it to
a kernel. One example would be an array with nine elements, split into
two `vector<4 x f32>` and a single scalar `f32`.
With this change, this will be raised to a global constant of full
length by putting the pieces together if they're constant, so we can
reason about the constant array.
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Signed-off-by: Lukas Sommer <lukas.sommer@codeplay.com>
