This commit replaces the old memory instrumentation with a new
implementation that scans carriers instead of wrapping
erts_alloc/erts_free. The old implementation could not extract
information without halting the emulator, had considerable runtime
overhead, and the memory maps it produced were noisy and lacked
critical information.

Since the new implementation walks through existing data structures
there's no longer a need to start the emulator with special flags to
get information about carrier utilization/fragmentation. Memory
fragmentation is also easier to diagnose as it's presented on a
per-carrier basis which eliminates the need to account for "holes"
between mmap segments.

To help track allocations, each allocation can now be tagged with
what it is and who allocated it at the cost of one extra word per
allocation. This is controlled on a per-allocator basis with the
+M<S>atags option, and is enabled by default for binary_alloc and
driver_alloc (which is also used by NIFs).

* siri/cuddle:
  [cdv] Fix test of size limit reached on crash dump, again

* maint:
  ErLLVM: Preserve precise BEAM tailcall semantics
  observer: Fix change accum
  Remove double calls
  observer: Don't crash for late messages
  observer: Optimize tv tab for many tables

* dgud/observer/opt-tv-tab/OTP-14856:
  observer: Fix change accum
  Remove double calls
  observer: Don't crash for late messages
  observer: Optimize tv tab for many tables

Conflicts:
	lib/observer/src/crashdump_viewer.erl

This test failed every now and then since the selected max size could
be equal to actual size of the dump - so the dump was not
truncated. This is now corrected.

Make it a virtual table, the only table which was not a virtual table.
Updating 10000 rows with many columns and alternating colors takes too
long time to be a viable solution.

When a process has many links and/or monitors, it could earlier take
very long time to display the process information window. This is now
improved by only showing a few links and monitors, and then an link
named "more..." to expand the rest.

Reading of the "Link list" from a crashdump is also improved.