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nir/lower_vec_to_regs: always set cursor before inserting reg

Pavel Ondračka requested to merge ondracka/mesa:nir_lower_vec_to_regs_cursor_fix into main

nir/lower_vec_to_regs: always set cursor before inserting decl_reg

Otherwise we can end with invalid curson in some cases, specifically, if we encounter an identity vector and thus neither register declaration nor swizzle is inserted, it can lead to invalid cursor and a crash later.

Suggested by: Alyssa Rosenzweig alyssa@rosenzweig.io

Closes: #10905 (closed)

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