gdb: change regcache interface to use array_view

Change most of regcache (and base classes) to use array_view when
possible, instead of raw pointers.  By propagating the use of array_view
further, it enables having some runtime checks to make sure the what we
read from or write to regcaches has the expected length (such as the one
in the `copy(array_view, array_view)` function.  It also integrates well
when connecting with other APIs already using gdb::array_view.

Add some overloads of the methods using raw pointers to avoid having to
change all call sites at once (which is both a lot of work and risky).

I tried to do this change in small increments, but since many of these
functions use each other, it ended up simpler to do it in one shot than
having a lot of intermediary / transient changes.

This change extends into gdbserver as well, because there is some part
of the regcache interface that is shared.

Changing the reg_buffer_common interface to use array_view caused some
build failures in nat/aarch64-scalable-linux-ptrace.c.  That file
currently "takes advantage" of the fact that
reg_buffer_common::{raw_supply,raw_collect} operates on `void *`, which
IMO is dangerous.  It uses raw_supply/raw_collect directly on
uint64_t's, which I guess is fine because it is expected that native
code will have the same endianness as the debugged process.  To
accomodate that, add some overloads of raw_collect and raw_supply that
work on uint64_t.

This file also uses raw_collect and raw_supply on `char` pointers.
Change it to use `gdb_byte` pointers instead.  Add overloads of
raw_collect and raw_supply that work on `gdb_byte *` and make an
array_view on the fly using the register's size.  Those call sites could
be converted to use array_view with not much work, in which case these
overloads could be removed, but I didn't want to do it in this patch, to
avoid starting to dig in arch-specific code.

During development, I inadvertently changed reg_buffer::raw_compare's
behavior to not accept an offset equal to the register size.  This
behavior (effectively comparing 0 bytes, returning true) change was
caught by the AArch64 SME core tests.  Add a selftest to make sure that
this raw_compare behavior is preserved in the future.

Change-Id: I9005f04114543ddff738949e12d85a31855304c2
Reviewed-By: John Baldwin <jhb@FreeBSD.org>

gdb/frame.c

@@ -1108,9 +1108,9 @@ get_frame_func (frame_info_ptr this_frame)
 std::unique_ptr<readonly_detached_regcache>
 frame_save_as_regcache (frame_info_ptr this_frame)
 {
-  auto cooked_read = [this_frame] (int regnum, gdb_byte *buf)
+  auto cooked_read = [this_frame] (int regnum, gdb::array_view<gdb_byte> buf)
     {
-      if (!deprecated_frame_register_read (this_frame, regnum, buf))
+      if (!deprecated_frame_register_read (this_frame, regnum, buf.data ()))
 	return REG_UNAVAILABLE;
       else
 	return REG_VALID;