[llvm] [llc] set canonical triple in module (PR #203725)

[Luke Lau via llvm-commits]

https://github.com/lukel97 approved this pull request.

LGTM + reverse ping. This fixes the RISC-V buildbots (https://lab.llvm.org/buildbot/#/builders/87/) after #215796 

https://github.com/llvm/llvm-project/pull/203725