[llvm] [SimplifyCFG] Supporting hoisting/sinking callbases with differing attrs (PR #109472)

[Nikita Popov via llvm-commits]

================
@@ -1747,6 +1727,36 @@ static bool isSafeCheapLoadStore(const Instruction *I,
          getLoadStoreAlignment(I) < Value::MaximumAlignment;
 }
 
+static std::optional<AttributeList> tryIntersectCBAttrs(const CallBase *CB0,
+                                                        const CallBase *CB1) {
+  AttributeList AL0 = CB0->getAttributes();
+  if (CB0 == CB1)
+    return AL0;
+
+  return AL0.intersectWith(CB0->getContext(), CB1->getAttributes());
+}
+
+static bool areIdenticalUpToCommutativity(const Instruction *I1,
+                                          const Instruction *I2) {
----------------
nikic wrote:

Why was this function moved?

https://github.com/llvm/llvm-project/pull/109472