[Object/ELF] - Refine the error reported when section's offset + size overruns the file buffer.

This is a follow-up requested in comments for D70826.

It changes the message from
"section X has a sh_offset (Y) + sh_size (Z) that cannot be represented"
to
"section X has a sh_offset (Y) + sh_size (Z) that is greater than the file size (0xABC)"

when section's sh_offset + sh_size overruns a file buffer.

Differential revision: https://reviews.llvm.org/D70893