[lld] [llvm] [Object][ELF] Support extended header for Object Parser in ELF (PR #162288)

[Fangrui Song via llvm-commits]

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@@ -529,6 +529,11 @@ struct Elf_Ehdr_Impl {
 
   unsigned char getFileClass() const { return e_ident[ELF::EI_CLASS]; }
   unsigned char getDataEncoding() const { return e_ident[ELF::EI_DATA]; }
+  bool HasHeaderExtension() const {
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MaskRay wrote:

`header` isn't clear - it could mean elf header, program header, or section header.

perhaps `hasPhdrNumExtension`

https://github.com/llvm/llvm-project/pull/162288