[llvm] [SROA] Only try additional vector type candidates when needed (PR #77678)

[Matt Arsenault via llvm-commits]

================
@@ -2216,86 +2317,9 @@ static VectorType *isVectorPromotionViable(Partition &P, const DataLayout &DL) {
     }
   }
 
-  // If we didn't find a vector type, nothing to do here.
-  if (CandidateTys.empty())
----------------
arsenm wrote:

It would be easier to review if the NFC move-to-function part were pre-committed. Not sure where the logic change is 

https://github.com/llvm/llvm-project/pull/77678