[llvm] [ELF]Add overflow check to ELF note iterator (PR #160451)

[Ruoyu Qiu via llvm-commits]

cabbaken wrote:

> ELFObjectFileTest.cpp is for testing the ELFObjectFile.cpp file. There's ELFTest.cpp for testing ELF.h/ELF.cpp, so you should add it to that one.

I've added the unit test in ELFTest.cpp.

https://github.com/llvm/llvm-project/pull/160451