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aco/ra: prevent underflow register for p_create_vector operands

Daniel Schürmann requested to merge daniel-schuermann/mesa:aco_fix_ra_vector into main

It could happen that we tested negative out-of-range registers for p_create_vector operands resulting in a crash.

Fixes: 8962510e ('aco/ra: Conservatively refactor get_reg_specified to use PhysRegInterval') Closes: #4697 (closed)

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