nir: Add nir_builder_at
Creates and returns a nir_builder from a cursor. The nir_function_impl
is retrieved using said cursor. This should be fine as long as it is not
used on extracted control flow.Based on !23860 (merged).
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Creates and returns a nir_builder from a cursor. The nir_function_impl
is retrieved using said cursor. This should be fine as long as it is not
used on extracted control flow.Based on !23860 (merged).