[llvm] Use std::optional instead of None in comments (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

1 files changed, 4 insertions, 4 deletions

diff --git a/llvm/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp b/llvm/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp
index ea4b7165317e..973e3b4d708c 100644
--- a/llvm/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp
+++ b/llvm/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp
@@ -541,10 +541,10 @@ class LoopConstrainer {
 
   // Calculated subranges we restrict the iteration space of the main loop to.
   // See the implementation of `calculateSubRanges' for more details on how
-  // these fields are computed.  `LowLimit` is None if there is no restriction
-  // on low end of the restricted iteration space of the main loop.  `HighLimit`
-  // is None if there is no restriction on high end of the restricted iteration
-  // space of the main loop.
+  // these fields are computed.  `LowLimit` is std::nullopt if there is no
+  // restriction on low end of the restricted iteration space of the main loop.
+  // `HighLimit` is std::nullopt if there is no restriction on high end of the
+  // restricted iteration space of the main loop.
 
   struct SubRanges {
     std::optional<const SCEV *> LowLimit;