[llvm] [ReachingDefAnalysis] Extend the analysis to stack objects. (PR #118097)

[Mikhail Gudim via llvm-commits]

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@@ -234,7 +301,10 @@ void ReachingDefAnalysis::reset() {
 
 void ReachingDefAnalysis::init() {
   NumRegUnits = TRI->getNumRegUnits();
+  NumStackObjects = MF->getFrameInfo().getNumObjects();
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mgudim wrote:

> Do you need to make them member variables?

We don't need to. But on the other hand, do you want to call `MI.getParent()->getFrameInfo().getNumObjects()` every time just to save a little bit of space? I think a separate variable makes the code more readable and also it is consistent with `NumRegUnits`.

https://github.com/llvm/llvm-project/pull/118097