lib: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

Remove $FreeBSD$: one-line .c pattern

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

Re-enable proc_test:symbol_lookup after r360979.

PR: 244732
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

Temporarily skip 2 failing tests after llvm10 import

PR: 244732
Sponsored by: The FreeBSD Foundation

Detach from the child process before completing the test.

Otherwise the child will receive SIGTRAP if the parent exits first.

Add an envp argument to proc_create().

This is needed to support dtrace's -x setenv option.

MFC after: 2 weeks

Eliminate the last user of basename_r() in the base system.

In this case it's fairly easy to make use of basename().

Refine symtab sorting in libproc.

Add some rules to more closely match what illumos does when an address
resolves to multiple symbols:
- prefer non-local symbols
- prefer symbols with fewer leading underscores and no leading '$'

Add some regression tests to verify these rules.

libproc: Match prefixes when looking up mapped object by name.

When looking up an object by name, allow prefix matches if no direct match
is found. This allows one to, for example, match libc entry probes with:

# dtrace -n 'pid$target:libc.so::entry' -c ./foo

instead of requiring "libc.so.7" or a glob.

Also remove proc_obj2map() as it currently just duplicates the
functionality of proc_name2map(). It's supposed to take a Solaris
link-map ID as a paramter, but support for this isn't implemented and
isn't required to support DTrace's pid provider.

Enable libproc symbol_lookup tests on arm64

This reverts part of r286863, as the kernel support required by these
tests was added in r287105.

PR: 202305
Sponsored by: The FreeBSD Foundation

On arm64 disable three tests that hang or panic

Each issue has a PR open to track. This workaround allows us to run the
tests to investigate the failures and avoid any new regressions.

PR: 202304, 202305, 202307
Reviewed by: ngie
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3378

Ensure that we don't try to demangle a symbol name if we failed to look
up the symbol. Add a test to exercise this code path.

Reviewed by: adrian

Hook up support for userland CTF support in DTrace. This required some
modifications to libproc to support fetching the CTF info for a given file.

With this change, dtrace(1) is able to resolve type info for function and
USDT probe arguments, and function return values. In particular, the args[n]
syntax should now work for referencing arguments of userland probes,
provided that the requisite CTF info is available.

The uctf tests pass if the test programs are compiled with CTF info. The
current infrastructure around the DTrace test suite doesn't support this
yet.

Differential Revision: https://reviews.freebsd.org/D891
MFC after: 1 month
Relnotes: yes
Sponsored by: EMC / Isilon Storage Division

Add some ATF tests for libproc.

Differential Revision: D710
Reviewed by: jmmv, ngie, rpaulo