libc: Purge unneeded cdefs.h

These sys/cdefs.h are not needed. Purge them. They are mostly left-over
from the $FreeBSD$ removal. A few in libc are still required for macros
that cdefs.h defines. Keep those.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D42385

Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

Finish revert of r358672, missed in r358688.

Manual reverts never succeed correctly.

Reported by: luporl

powerpc/powerpc64: Enforce natural alignment in memcpy

Summary:
POWER architecture CPUs (Book-S) require natural alignment for
cache-inhibited storage accesses. Since we can't know the caching model
for a page ahead of time, always enforce natural alignment in memcpy.
This fixes a SIGBUS in X with acceleration enabled on POWER9.

As part of this, revert r358672, it's no longer necessary with this fix.

Regression tested by alfredo.

Reviewed by: alfredo
Differential Revision: https://reviews.freebsd.org/D23969

[PowerPC64] restrict memcpy/bcopy optimization to POWER ISA >=V2.07

VSX instructions were added in POWER ISA V2.06 (POWER7), but it
requires data to be word-aligned. Such requirement was removed in
ISA V2.07B (POWER8).

Since current memcpy/bcopy optimization relies on VSX instructions
handling misalignment transparently, and kernel doesn't currently
implement an alignment error handler, this optimzation should be
restrict to ISA V2.07 onwards.

SIGBUS on stxvd2x instruction was reproduced in POWER7+ CPU.

Reviewed by: luporl, jhibbits, bdragon
Approved by: jhibbits (mentor)
Differential Revision: https://reviews.freebsd.org/D23958

[PPC64] memcpy/memmove/bcopy optimization

For copies shorter than 512 bytes, the data is copied using plain
ld/std instructions.
For 512 bytes or more, the copy is done in 3 phases:

Phase 1: copy from the src buffer until it's aligned at a 16-byte boundary
Phase 2: copy as many aligned 64-byte blocks from the src buffer as possible
Phase 3: copy the remaining data, if any

In phase 2, this code uses VSX instructions when available. Otherwise,
it uses ldx/stdx.

Submitted by: Luis Pires <lffpires_ruabrasil.org> (original version)
Reviewed by: jhibbits
Differential Revision: https://reviews.freebsd.org/D15118