* 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
2c3d87b168bf522f538e78325fdae71c320e6e20 introduced a new test that
passes on macOS but fails on other operating systems. This commit makes
it only run on macOS.
Move common tests by target file format (Wasm, MachO) into helper
functions in `link.zig`, and sort alphabetically within for easier
tracking versus file organization on disk.
Improve testing MachO binaries by verbose printing of the symtab
which includes segment,section names for defined symbols, and
import (dylib) name for imports.
MachO linker now handles `-needed-l<name>`, `-needed_library=<name>`
and `-needed_framework=<name>`. While on macOS `-l` is equivalent
to `-needed-l`, and `-framework` to `-needed_framework`, it can be
used to the same effect as on Linux if combined with `-dead_strip_dylibs`.
This commit also adds handling for `-needed_library` which is macOS
specific flag only (in addition to `-needed-l`).
Finally, in order to leverage new linker testing harness, this commit
added ability to specify lowering to those flags via `build.zig`:
`linkSystemLibraryNeeded` (and related), and `linkFrameworkNeeded`.
