sys: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl s

sys: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

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sys: Remove $FreeBSD$: one-line .h pattern

Remove /^\s*\*+\s*\$FreeBSD\$.*$\n/

Remove checks for <sys/cdefs.h> being included.

These files no longer depend on the macros required when these checks
were added.

PR: 263102 (exp-run)
Reviewed by: brooks, imp, emaste
Differential

Remove checks for <sys/cdefs.h> being included.

These files no longer depend on the macros required when these checks
were added.

PR: 263102 (exp-run)
Reviewed by: brooks, imp, emaste
Differential Revision: https://reviews.freebsd.org/D34804

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Remove checks for __GNUCLIKE_ASM assuming it is always true.

All supported compilers (modern versions of GCC and clang) support
this.

Many places didn't have an #else so would just silently do the

Remove checks for __GNUCLIKE_ASM assuming it is always true.

All supported compilers (modern versions of GCC and clang) support
this.

Many places didn't have an #else so would just silently do the wrong
thing. Ancient versions of icc (the original motivation for this) are
no longer a compiler FreeBSD supports.

PR: 263102 (exp-run)
Reviewed by: brooks, imp
Differential Revision: https://reviews.freebsd.org/D34797

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Merge common parts of i386 and amd64's ieeefp.h into x86/x86_ieeefp.h

MFC after: 1 week
Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D26292