leak_analyser.sh: Remove usage of obsolescent egrep

Change-Id: Ibd1228238901cb7b1e117e0c611be64046c14b4e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6472
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

build: Remove usage of obsolescent egrep

* "egrep: warning: egrep is obsolescent; using grep -E"
* egrep on haiku is a shell script calling grep -E
* given the warnings in the latest egrep, lets get
ahead of the curve and migrate to grep -E

Change-Id: I0fc2b936c7a9c52f87caf97d8e9ac42516fee014
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5718
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

leak_analyser: Update excludes with more generic regex for ICU.

Also add initialize_before of libroot to the default excludes.

libroot_debug: Merge guarded heap into libroot_debug.

The individual debug heap implementations are now exposed via a
structure of function pointers and a common frontend dispatches the
malloc and malloc_debug APIs through them.

The MALLOC_DEBUG environment variable can be used to select the guarded
heap by adding 'g', otherwise the debug heap is used as the default.
Consequently the separate libroot_guarded is not needed anymore and has
been removed.

To allow the use of environment variables this early, init_env_post_heap
has been added and the heap dependent atfork() moved there. This allowed
to fold the code of init_heap_post_env into init_heap so the former has
been removed.

Add leak_analyser shell script to analyse guarded heap info.

The script runs the guarded heap allocation output through c++filt to
demangle stack trace symbols and filters out a list of known globals
that are never freed. It also allows to exclude further patterns
provided on the command line.

leak_analyser: Update excludes with more generic regex for ICU.

Also add initialize_before of libroot to the default excludes.

libroot_debug: Merge guarded heap into libroot_debug.

The individual debug heap implementations are now exposed via a
structure of function pointers and a common frontend dispatches the
malloc and malloc_debug APIs through them.

The MALLOC_DEBUG environment variable can be used to select the guarded
heap by adding 'g', otherwise the debug heap is used as the default.
Consequently the separate libroot_guarded is not needed anymore and has
been removed.

To allow the use of environment variables this early, init_env_post_heap
has been added and the heap dependent atfork() moved there. This allowed
to fold the code of init_heap_post_env into init_heap so the former has
been removed.

Add leak_analyser shell script to analyse guarded heap info.

The script runs the guarded heap allocation output through c++filt to
demangle stack trace symbols and filters out a list of known globals
that are never freed. It also allows to exclude further patterns
provided on the command line.