remove dead code

Author: sivan-shani

llvm/include/llvm/Support/ELFAttributes.h

@@ -42,11 +42,6 @@ struct BuildAttributeSubSection {
   unsigned IsOptional;
   unsigned ParameterType;
   SmallVector<BuildAttributeItem, 64> Content;
-  BuildAttributeSubSection() {};
-  BuildAttributeSubSection(const std::string &N, unsigned Opt, unsigned Type,
-                           SmallVector<BuildAttributeItem, 64> &&Content)
-      : Name(N), IsOptional(Opt), ParameterType(Type),
-        Content(std::move(Content)) {}
 };
 
 // Tag to string: ELF extended build attribute section