intel/compiler: don't instantiate a builder for each instruction

Don't instantiate a builder for each instruction during
lower_integer_multiplication(). Instantiate one only when needed.

On the other hand, these unneeded builders don't seem to cost much to
init, so I don't expect any significant difference in performance:
this is mostly about code organization.

Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Caio Marcelo de Oliveira Filho <[email protected]>
Signed-off-by: Paulo Zanoni <[email protected]>

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