[ADT] Use std::optional in StringSwitch.h (NFC)
authorKazu Hirata <kazu@google.com>
Sun, 27 Nov 2022 19:48:55 +0000 (11:48 -0800)
committerKazu Hirata <kazu@google.com>
Sun, 27 Nov 2022 19:48:55 +0000 (11:48 -0800)
commitdd436d3cff53db0c64cc4ef5a671b7985917130e
tree17204140d154667f25d03cfafa818a212041c436
parent4bcab22578b59dbf8afb7ae0ae6229574451de7d
[ADT] Use std::optional in StringSwitch.h (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/include/llvm/ADT/StringSwitch.h