Rename assym.s to .S to use the compiler driver

[emaste]

Summary

By convention .s is assembled by ${AS} while .S is assembled by ${CC}. Consistently use the compiler driver across all platforms, including those that do not have an in-tree standalone assembler, like arm64.

[emaste]

• remove stale assym.s and depend file
• chase the rename across the tree

[imp]

why foo.S.orig? Seems like a mistake...

[emaste]

This might be sensible from a consistency perspective, but is not necessary; the underlying issue that prompted this is addressed in rS328883 from @andrew's input

[emaste]

In D14180#297908, @imp wrote:

why foo.S.orig? Seems like a mistake...

Oops, *.orig and LINT were added by accident; now removed.

[imp]

this looks good to my eye.

A couple of caveats... Years ago I tried a cleanup of things rebuilding too much and ran into issues with assym.s being in modules not for assym.s itself, but because other things got generated as a side effect. Be wary of these and be sure to test on all architectures... I don't have notes from the time, so I can't be less vague...

[emaste]

I wonder if we should rename it assym.inc instead, since we shouldn't be trying to assemble it with either as or Clang IAS.

[emaste]

Use .inc extension instead

[emaste]

sys/modules/hyperv/vmbus/Makefile

27 ↗

(On Diff #40343)

Accidentally left behind by a rebase, will be removed.

[imp]

this looks good to my eye.