[ELF] report section sizes when output file too large

Fixes PR48523. When the linker errors with "output file too large",
one question that comes to mind is how the section sizes differ from
what they were previously. Unfortunately, this information is lost
when the linker exits without writing the output file. This change
makes it so that the error message includes the sizes of the largest
sections.

Reviewed By: MaskRay, grimar, jhenderson

Differential Revision: https://reviews.llvm.org/D94560