[llvm] [llvm][ELF]Add Shdr check for getBuildID (PR #126537)

[Ruoyu Qiu via llvm-commits]

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@@ -24,6 +24,26 @@ using namespace llvm::object;
 namespace {
 
 template <typename ELFT> BuildIDRef getBuildID(const ELFFile<ELFT> &Obj) {
+  auto findBuildID = [&Obj](const auto &ShdrOrPhdr,
+                            uint64_t Alignment) -> std::optional<BuildIDRef> {
+    Error Err = Error::success();
+    for (auto N : Obj.notes(ShdrOrPhdr, Err))
+      if (N.getType() == ELF::NT_GNU_BUILD_ID &&
+          N.getName() == ELF::ELF_NOTE_GNU)
+        return N.getDesc(Alignment);
+    consumeError(std::move(Err));
+    return std::nullopt;
+  };
+
+  auto Sections = cantFail(Obj.sections());
+  if (!Sections.empty()) {
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cabbaken wrote:

> If you want, you can do so.

Got it.

https://github.com/llvm/llvm-project/pull/126537