[Scalar] Use std::optional in GVN.cpp (NFC)
authorKazu Hirata <kazu@google.com>
Sat, 26 Nov 2022 07:55:43 +0000 (23:55 -0800)
committerKazu Hirata <kazu@google.com>
Sat, 26 Nov 2022 07:55:44 +0000 (23:55 -0800)
commitb54cd3f09c964a123a39274ddfb15341a2814ea9
tree1adacd8dff89a496f2591891d56407628037fd15
parentedace862f63a4644c199eb8ca90b8ef1b2353b39
[Scalar] Use std::optional in GVN.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
llvm/lib/Transforms/Scalar/GVN.cpp