[llvm] [LoopVectorize] Use new single string variant of reportVectorizationFailure (PR #120414)

[Hari Limaye via llvm-commits]

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@@ -666,7 +666,6 @@ bool LoopVectorizationLegality::canVectorizeOuterLoop() {
   // Check whether we are able to set up outer loop induction.
   if (!setupOuterLoopInductions()) {
     reportVectorizationFailure("Unsupported outer loop Phi(s)",
-                               "Unsupported outer loop Phi(s)",
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hazzlim wrote:

Small thought - do we want to unify the style for all `reportVectorizationFailure` calls to either capitalize or not-capitalize the first word of the string? As currently it looks like it's a mix between both.

Otherwise LGTM, once clang-format is happy.

https://github.com/llvm/llvm-project/pull/120414