[llvm] [SandboxVec][Legality] Query the scheduler for legality (PR #114616)

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@@ -167,7 +172,9 @@ class LegalityAnalysis {
   }
   /// Checks if it's legal to vectorize the instructions in \p Bndl.
   /// \Returns a LegalityResult object owned by LegalityAnalysis.
-  const LegalityResult &canVectorize(ArrayRef<Value *> Bndl);
+  /// p SkipScheduling skips the scheduler check and is only meant for testing.
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vporpo wrote:

I added a TODO

https://github.com/llvm/llvm-project/pull/114616