[LiveDebugVariables] Add basic verification

Add a basic implementation of verifyAnalysis that just checks that the
analysis does not refer to any SlotIndexes for instructions that have
been deleted. This was useful for diagnosing some SlotIndexes-related
problems caused by llvm#67038.

Author: jayfoad

llvm/lib/CodeGen/LiveDebugVariables.cpp

@@ -492,6 +492,13 @@ class UserValue {
   /// Return DebugLoc of this UserValue.
   const DebugLoc &getDebugLoc() { return dl; }
 
+  void verify() const {
+    for (auto I = locInts.begin(), E = locInts.end(); I != E; ++I) {
+      assert(!I.start().isPoisoned());
+      assert(!I.stop().isPoisoned());
+    }
+  }
+
   void print(raw_ostream &, const TargetRegisterInfo *);
 };
 
@@ -655,6 +662,11 @@ class LDVImpl {
     ModifiedMF = false;
   }
 
+  void verify() const {
+    for (auto [DV, UV] : userVarMap)
+      UV->verify();
+  }
+
   /// Map virtual register to an equivalence class.
   void mapVirtReg(Register VirtReg, UserValue *EC);
 
@@ -1320,6 +1332,11 @@ void LiveDebugVariables::releaseMemory() {
     static_cast<LDVImpl*>(pImpl)->clear();
 }
 
+void LiveDebugVariables::verifyAnalysis() const {
+  if (pImpl)
+    static_cast<LDVImpl *>(pImpl)->verify();
+}
+
 LiveDebugVariables::~LiveDebugVariables() {
   if (pImpl)
     delete static_cast<LDVImpl*>(pImpl);

llvm/lib/CodeGen/LiveDebugVariables.h

@@ -56,6 +56,7 @@ class LLVM_LIBRARY_VISIBILITY LiveDebugVariables : public MachineFunctionPass {
   bool runOnMachineFunction(MachineFunction &) override;
   void releaseMemory() override;
   void getAnalysisUsage(AnalysisUsage &) const override;
+  void verifyAnalysis() const override;
 
   MachineFunctionProperties getSetProperties() const override {
     return MachineFunctionProperties().set(