[clang] [llvm] [LLVM][IR] Use splat syntax when printing Constant[Data]Vector. (PR #112548)

[Paul Walker via cfe-commits]

paulwalker-arm wrote:

I've pushed https://github.com/llvm/llvm-project/commit/246b57cb2086b22ad8b41051c77e86ef478053a1 to fix the failing PowerPC tests.  For what it's worth I think the tests are overly restricted to only run on PowerPC machines, hence the reason they only failed after the PR landed.

I've updated some of the RUN lines so they at least run when the REQUIRES lines is removed, which I did locally to ensure my changes were correct.  I don't have enough context so am guessing the intent is for them to use `powerpc-registered-target` rather than `target=powerpc*`.

https://github.com/llvm/llvm-project/pull/112548