* Sema: implement linksection on functions
* Implement function linksection in Sema.
* Don't clobber function linksection/align/addrspace in Sema.
* Fix copy-paste typo in tests.
* Add a bunch of missing test_step.dependOn.
* Fix checkInSymtab match.
Closes#12546
Improve testing MachO binaries by verbose printing of the symtab
which includes segment,section names for defined symbols, and
import (dylib) name for imports.