[Analysis] Use std::optional in BasicAliasAnalysis.cpp (NFC)

This is part of an effort to migrate from llvm::Optional to
std::optional:

https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716

diff --git a/llvm/lib/Analysis/BasicAliasAnalysis.cpp b/llvm/lib/Analysis/BasicAliasAnalysis.cpp
index 537d0c4..bf50b50 100644 (file)
--- a/llvm/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/llvm/lib/Analysis/BasicAliasAnalysis.cpp
@@ -58,6 +58,7 @@
 #include <cassert>
 #include <cstdint>
 #include <cstdlib>
+#include <optional>
 #include <utility>
 
 #define DEBUG_TYPE "basicaa"
@@ -484,7 +485,7 @@ struct BasicAAResult::DecomposedGEP {
   SmallVector<VariableGEPIndex, 4> VarIndices;
   // Are all operations inbounds GEPs or non-indexing operations?
   // (None iff expression doesn't involve any geps)
-  Optional<bool> InBounds;
+  std::optional<bool> InBounds;
 
   void dump() const {
     print(dbgs());
@@ -1182,7 +1183,7 @@ AliasResult BasicAAResult::aliasGEP(
 
   // Try to determine the range of values for VarIndex such that
   // VarIndex <= -MinAbsVarIndex || MinAbsVarIndex <= VarIndex.
-  Optional<APInt> MinAbsVarIndex;
+  std::optional<APInt> MinAbsVarIndex;
   if (DecompGEP1.VarIndices.size() == 1) {
     // VarIndex = Scale*V.
     const VariableGEPIndex &Var = DecompGEP1.VarIndices[0];
@@ -1306,7 +1307,7 @@ AliasResult BasicAAResult::aliasPHI(const PHINode *PN, LocationSize PNSize,
   // on corresponding edges.
   if (const PHINode *PN2 = dyn_cast<PHINode>(V2))
     if (PN2->getParent() == PN->getParent()) {
-      Optional<AliasResult> Alias;
+      std::optional<AliasResult> Alias;
       for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) {
         AliasResult ThisAlias = AAQI.AAR.alias(
             MemoryLocation(PN->getIncomingValue(i), PNSize),