[llvm] Use std::nullopt instead of None (NFC)

This patch mechanically replaces None with std::nullopt where the
compiler would warn if None were deprecated.  The intent is to reduce
the amount of manual work required in migrating from Optional to
std::optional.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/Support/APInt.cpp b/llvm/lib/Support/APInt.cpp
index 399b96c..ba2b2c1 100644
--- a/llvm/lib/Support/APInt.cpp
+++ b/llvm/lib/Support/APInt.cpp
@@ -2952,7 +2952,7 @@ llvm::APIntOps::SolveQuadraticEquationWrap(APInt A, APInt B, APInt C,
   // between them, so they would both be contained between X and X+1.
   if (!SignChange) {
     LLVM_DEBUG(dbgs() << __func__ << ": no valid solution\n");
-    return None;
+    return std::nullopt;
   }
 
   X += 1;
@@ -2964,7 +2964,7 @@ Optional<unsigned>
 llvm::APIntOps::GetMostSignificantDifferentBit(const APInt &A, const APInt &B) {
   assert(A.getBitWidth() == B.getBitWidth() && "Must have the same bitwidth");
   if (A == B)
-    return llvm::None;
+    return std::nullopt;
   return A.getBitWidth() - ((A ^ B).countLeadingZeros() + 1);
 }