[llvm] [llvm-nm][WebAssembly] Print function symbol sizes (PR #81315)

[Derek Schuff via llvm-commits]

dschuff wrote:

Actually WDYT of printing the symbol size in `llvm-objdump -t` too? It is a change to the output format for that flag (we weren't printing it at all before) but now our format matches ELF, and in any case the info could be useful and it makes sense for objdump to mirror nm.

https://github.com/llvm/llvm-project/pull/81315