[llvm-readobj] Use std::optional in ELFDumper.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

diff --git a/llvm/tools/llvm-readobj/ELFDumper.cpp b/llvm/tools/llvm-readobj/ELFDumper.cpp
index 0ff0677..7f66266 100644 (file)
--- a/llvm/tools/llvm-readobj/ELFDumper.cpp
+++ b/llvm/tools/llvm-readobj/ELFDumper.cpp
@@ -67,6 +67,7 @@
 #include <cstdlib>
 #include <iterator>
 #include <memory>
+#include <optional>
 #include <string>
 #include <system_error>
 #include <vector>
@@ -371,8 +372,8 @@ protected:
   const Elf_Shdr *DotDynsymSec = nullptr;
   const Elf_Shdr *DotAddrsigSec = nullptr;
   DenseMap<const Elf_Shdr *, ArrayRef<Elf_Word>> ShndxTables;
-  Optional<uint64_t> SONameOffset;
-  Optional<DenseMap<uint64_t, std::vector<uint32_t>>> AddressToIndexMap;
+  std::optional<uint64_t> SONameOffset;
+  std::optional<DenseMap<uint64_t, std::vector<uint32_t>>> AddressToIndexMap;
 
   const Elf_Shdr *SymbolVersionSection = nullptr;   // .gnu.version
   const Elf_Shdr *SymbolVersionNeedSection = nullptr; // .gnu.version_r
@@ -940,7 +941,8 @@ ELFDumper<ELFT>::getSymbolSectionIndex(const Elf_Sym &Symbol, unsigned SymIndex,
   if (Ndx != SHN_UNDEF && Ndx < SHN_LORESERVE)
     return Ndx;
 
-  auto CreateErr = [&](const Twine &Name, Optional<unsigned> Offset = None) {
+  auto CreateErr = [&](const Twine &Name,
+                       std::optional<unsigned> Offset = None) {
     std::string Desc;
     if (Offset)
       Desc = (Name + "+0x" + Twine::utohexstr(*Offset)).str();
@@ -2796,9 +2798,9 @@ Error MipsGOTParser<ELFT>::findGOT(Elf_Dyn_Range DynTable,
   }
 
   // Lookup dynamic table tags which define the GOT layout.
-  Optional<uint64_t> DtPltGot;
-  Optional<uint64_t> DtLocalGotNum;
-  Optional<uint64_t> DtGotSym;
+  std::optional<uint64_t> DtPltGot;
+  std::optional<uint64_t> DtLocalGotNum;
+  std::optional<uint64_t> DtGotSym;
   for (const auto &Entry : DynTable) {
     switch (Entry.getTag()) {
     case ELF::DT_PLTGOT:
@@ -2849,8 +2851,8 @@ Error MipsGOTParser<ELFT>::findGOT(Elf_Dyn_Range DynTable,
 template <class ELFT>
 Error MipsGOTParser<ELFT>::findPLT(Elf_Dyn_Range DynTable) {
   // Lookup dynamic table tags which define the PLT layout.
-  Optional<uint64_t> DtMipsPltGot;
-  Optional<uint64_t> DtJmpRel;
+  std::optional<uint64_t> DtMipsPltGot;
+  std::optional<uint64_t> DtJmpRel;
   for (const auto &Entry : DynTable) {
     switch (Entry.getTag()) {
     case ELF::DT_MIPS_PLTGOT: