[Attributor] Check HeapToStack's state for isKnownHeapToStack

[jhuber6]

Summary

This patch changes the isKnownHeapToStack and isAssumedHeapToStack
member functions to return if a function call is going to be altered by
HeapToStack.

[jhuber6]

Fixing.

[jdoerfert]

LG, one nit

llvm/lib/Transforms/IPO/AttributorAttributes.cpp

5028

Add the isValid check here.

llvm/include/llvm/Transforms/IPO/Attributor.h

struct AAValueSimplify : public StateWrapper<BooleanState, AbstractAttribute> {
   static const char ID;
 };
 
 struct AAHeapToStack : public StateWrapper<BooleanState, AbstractAttribute> {
   using Base = StateWrapper<BooleanState, AbstractAttribute>;
   AAHeapToStack(const IRPosition &IRP, Attributor &A) : Base(IRP) {}
 
   /// Returns true if HeapToStack conversion is assumed to be possible.
-  bool isAssumedHeapToStack() const { return getAssumed(); }
+  virtual bool isAssumedHeapToStack(CallBase &CB) const = 0;
 
   /// Returns true if HeapToStack conversion is known to be possible.
-  bool isKnownHeapToStack() const { return getKnown(); }
+  virtual bool isKnownHeapToStack(CallBase &CB) const = 0;
 
   /// Create an abstract attribute view for the position \p IRP.
   static AAHeapToStack &createForPosition(const IRPosition &IRP, Attributor &A);
 
   /// See AbstractAttribute::getName()
   const std::string getName() const override { return "AAHeapToStack"; }
 
   /// See AbstractAttribute::getIdAddr()

llvm/lib/Transforms/IPO/AttributorAttributes.cpp

 struct AAHeapToStackImpl : public AAHeapToStack {
   AAHeapToStackImpl(const IRPosition &IRP, Attributor &A)
       : AAHeapToStack(IRP, A) {}
 
   const std::string getAsStr() const override {
     return "[H2S] Mallocs: " + std::to_string(MallocCalls.size());
   }
 
+  bool isAssumedHeapToStack(CallBase &CB) const override {
+    return MallocCalls.contains(&CB) && !BadMallocCalls.count(&CB);
+  }
+
+  bool isKnownHeapToStack(CallBase &CB) const override {
+    return MallocCalls.contains(&CB) && !BadMallocCalls.count(&CB);
+  }
+
   ChangeStatus manifest(Attributor &A) override {
     assert(getState().isValidState() &&
            "Attempted to manifest an invalid state!");
 
     ChangeStatus HasChanged = ChangeStatus::UNCHANGED;
     Function *F = getAnchorScope();
     const auto *TLI = A.getInfoCache().getTargetLibraryInfoForFunction(*F);