[llvm] [SLP]Exclude non-profitable subtrees. (PR #162018)

[Simon Pilgrim via llvm-commits]

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@@ -8744,14 +8761,21 @@ void BoUpSLP::buildExternalUses(
 
         // Skip in-tree scalars that become vectors
         if (ArrayRef<TreeEntry *> UseEntries = getTreeEntries(U);
-            !UseEntries.empty()) {
+            !UseEntries.empty() &&
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RKSimon wrote:

won't any_of effectively do an empty() check as part of the iteration?

https://github.com/llvm/llvm-project/pull/162018