Use dSYM's file addr for Sections when it doesn't match binary

When adding a dSYM to a Module and it has different file addresses
from the already-present ObjectFile binary, change the Sections to
use the dSYM's file addresses so the symbol table and DWARF are
properly contained in the Sections.  Previously this was only done
for IsInMemory ObjectFiles, but it's more common than that.

Differential Revision: https://reviews.llvm.org/D108889
rdar://81504400