[llvm-pdbutil] Update #includes (NFC)

The header file uses std::optional, but it's realying a transitive
inclusion of <optional>.  Meanwhile, it no longer uses llvm::Optional.

diff --git a/llvm/tools/llvm-pdbutil/StreamUtil.h b/llvm/tools/llvm-pdbutil/StreamUtil.h
index 9d9c5f9..9d6030c 100644 (file)
--- a/llvm/tools/llvm-pdbutil/StreamUtil.h
+++ b/llvm/tools/llvm-pdbutil/StreamUtil.h
@@ -9,11 +9,11 @@
 #ifndef LLVM_TOOLS_LLVMPDBDUMP_STREAMUTIL_H
 #define LLVM_TOOLS_LLVMPDBDUMP_STREAMUTIL_H
 
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 
 #include <string>
+#include <optional>
 
 namespace llvm {
 namespace pdb {