Create magic symbol to mark .symtab as sorted.

ELF symbols don't have to be sorted, but ART always sorts them.
This is very useful property if libunwindstack can rely on it.
(that is, it can binary search the table instead of linear)

Bug: 110133331
Test: art/test.py -b --host
Change-Id: I4d491096a5bd4ea738a45bbc64fc9dea91c45575
2 files changed