[llvm] [SimplifyCFG] Mark div/rem as not-cheap to sink if we are replacing const denominator (PR #109007)

[Nikita Popov via llvm-commits]

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@@ -1954,6 +1954,16 @@ static bool isLifeTimeMarker(const Instruction *I) {
 // into variables.
 static bool replacingOperandWithVariableIsCheap(const Instruction *I,
                                                 int OpIdx) {
+  switch (I->getOpcode()) {
+    // Divide/Remainder by constant is typically much cheaper than by variable.
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nikic wrote:

You can use `I->isIntDivRem()` here.

https://github.com/llvm/llvm-project/pull/109007