Revert "[LAA] Remove one addRuntimeChecks function (NFC)."

This reverts commit c28114c8ffde705d7e16cd4c065fd23269661c81.

This causes some bots to fail:

http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-android/builds/30596/steps/build%20android%2Faarch64/logs/stdio

3 files changed, 21 insertions, 9 deletions

diff --git a/llvm/include/llvm/Analysis/LoopAccessAnalysis.h b/llvm/include/llvm/Analysis/LoopAccessAnalysis.h
index cea7523..26ddf92 100644
--- a/llvm/include/llvm/Analysis/LoopAccessAnalysis.h
+++ b/llvm/include/llvm/Analysis/LoopAccessAnalysis.h
@@ -541,8 +541,15 @@ public:
   unsigned getNumStores() const { return NumStores; }
   unsigned getNumLoads() const { return NumLoads;}
 
-  /// Add code that checks at runtime if the accessed arrays \in p PointerChecks
-  /// overlap.
+  /// Add code that checks at runtime if the accessed arrays overlap.
+  ///
+  /// Returns a pair of instructions where the first element is the first
+  /// instruction generated in possibly a sequence of instructions and the
+  /// second value is the final comparator value or NULL if no check is needed.
+  std::pair<Instruction *, Instruction *>
+  addRuntimeChecks(Instruction *Loc) const;
+
+  /// Generete the instructions for the checks in \p PointerChecks.
   ///
   /// Returns a pair of instructions where the first element is the first
   /// instruction generated in possibly a sequence of instructions and the
diff --git a/llvm/lib/Analysis/LoopAccessAnalysis.cpp b/llvm/lib/Analysis/LoopAccessAnalysis.cpp
index 35780bd..77270ab 100644
--- a/llvm/lib/Analysis/LoopAccessAnalysis.cpp
+++ b/llvm/lib/Analysis/LoopAccessAnalysis.cpp
@@ -2275,6 +2275,14 @@ std::pair<Instruction *, Instruction *> LoopAccessInfo::addRuntimeChecks(
   return std::make_pair(FirstInst, Check);
 }
 
+std::pair<Instruction *, Instruction *>
+LoopAccessInfo::addRuntimeChecks(Instruction *Loc) const {
+  if (!PtrRtChecking->Need)
+    return std::make_pair(nullptr, nullptr);
+
+  return addRuntimeChecks(Loc, PtrRtChecking->getChecks());
+}
+
 void LoopAccessInfo::collectStridedAccess(Value *MemAccess) {
   Value *Ptr = nullptr;
   if (LoadInst *LI = dyn_cast<LoadInst>(MemAccess))
diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index 3209fb5e..b139f85 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -2785,15 +2785,12 @@ void InnerLoopVectorizer::emitMemRuntimeChecks(Loop *L, BasicBlock *Bypass) {
   // Generate the code that checks in runtime if arrays overlap. We put the
   // checks into a separate block to make the more common case of few elements
   // faster.
-  auto *LAI = Legal->getLAI();
-  const auto &RtPtrChecking = *LAI->getRuntimePointerChecking();
-  if (!RtPtrChecking.Need)
-    return;
   Instruction *FirstCheckInst;
   Instruction *MemRuntimeCheck;
-  std::tie(FirstCheckInst, MemRuntimeCheck) = LAI->addRuntimeChecks(
-      MemCheckBlock->getTerminator(), RtPtrChecking.getChecks());
-  assert(MemRuntimeCheck && "Expected runtime checks to be generated");
+  std::tie(FirstCheckInst, MemRuntimeCheck) =
+      Legal->getLAI()->addRuntimeChecks(MemCheckBlock->getTerminator());
+  if (!MemRuntimeCheck)
+    return;
 
   if (MemCheckBlock->getParent()->hasOptSize()) {
     assert(Cost->Hints->getForce() == LoopVectorizeHints::FK_Enabled &&