[llvm] [utils] Add spirv triple to update_llc_test_checks (PR #150223)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon approved this pull request.

LGTM - are there many SPIRV uses of the update scripts yet? I didn't noticed anything in CodeGen/SPIRV

https://github.com/llvm/llvm-project/pull/150223