[NFC] Add LazyValueInfo::clear method

This method just calls LazyValueInfoImpl::clear

llvm/include/llvm/Analysis/LazyValueInfo.h

@@ -114,6 +114,9 @@ public:
   /// Inform the analysis cache that we have erased a block.
   void eraseBlock(BasicBlock *BB);
 
+  /// Complete flush all previously computed values
+  void clear(const Module *M);
+
   /// Print the \LazyValueInfo Analysis.
   /// We pass in the DTree that is required for identifying which basic blocks
   /// we can solve/print for, in the LVIPrinter.

llvm/lib/Analysis/LazyValueInfo.cpp

@@ -1885,6 +1885,11 @@ void LazyValueInfo::eraseBlock(BasicBlock *BB) {
   }
 }
 
+void LazyValueInfo::clear(const Module *M) {
+  if (PImpl) {
+    getImpl(PImpl, AC, M).clear();
+  }
+}
 
 void LazyValueInfo::printLVI(Function &F, DominatorTree &DTree, raw_ostream &OS) {
   if (PImpl) {