[clang] [llvm] [MC,llvm-readobj,yaml2obj] Support CREL relocation format (PR #91280)

[Peter Smith via cfe-commits]

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@@ -321,6 +321,11 @@ class ELFFile {
 
   std::vector<Elf_Rel> decode_relrs(Elf_Relr_Range relrs) const;
 
+  uint64_t crelHeader(ArrayRef<uint8_t> Content) const;
+  using RelsOrRelas = std::pair<std::vector<Elf_Rel>, std::vector<Elf_Rela>>;
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smithp35 wrote:

There is an identically named type in LLD which has a similar purpose but is slightly different https://github.com/llvm/llvm-project/blob/main/lld/ELF/InputSection.h#L39 . Is this likely to clash?

In LLD this is an exclusive or, it looks like this could be an inclusive or as both parts of the pair are accessed in `printDynamicRelocationsHelper` ; however that might just be for implementation convenience.

https://github.com/llvm/llvm-project/pull/91280