[Support] Use std::optional in raw_ostream.h (NFC)
authorKazu Hirata <kazu@google.com>
Sun, 27 Nov 2022 22:16:12 +0000 (14:16 -0800)
committerKazu Hirata <kazu@google.com>
Sun, 27 Nov 2022 22:16:13 +0000 (14:16 -0800)
commitcc0764e7fa4bfacdfafe0717446a72843eb29143
treea536a55e59632615f9e90fffcff4d1868aae1b29
parentcb31997beb77c14ac23a0c593eee7487b9721b17
[Support] Use std::optional in raw_ostream.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/Support/raw_ostream.h