[llvm] [SandboxVec][InstrInterval] Add ArrayRef constructor (PR #109357)

[Sriraman Tallam via llvm-commits]

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@@ -80,6 +80,17 @@ class InstrInterval {
     assert((FromI == ToI || FromI->comesBefore(ToI)) &&
            "FromI should come before TopI!");
   }
+  InstrInterval(ArrayRef<Instruction *> Instrs) {
+    assert(!Instrs.empty() && "Expected non-empty Instrs!");
+    FromI = Instrs[0];
+    ToI = Instrs[0];
+    for (auto *I : drop_begin(Instrs)) {
+      if (I->comesBefore(FromI))
+        FromI = I;
+      if (ToI->comesBefore(I))
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tmsri wrote:

else if here?  Either FromI moves or ToI moves but not both.

https://github.com/llvm/llvm-project/pull/109357