tcg: update version to HEAD as of 2025-07-18

[derSteFfi]

Fixes #211 and makes tcg compile for the first time on my machine

[k-sareen]

FYI after removing the sed/awk scripts, the tcg build command does not output a libtcmalloc.so, it outputs a libtcmalloc.lo, which does not work with LD_PRELOAD.

I believe the CI scripts currently not actually test tcg correctly as you can see here: https://github.com/daanx/mimalloc-bench/actions/runs/18081743181/job/51446049244#step:4:432.

I think the sed/awk scripts are still necessary, unfortunately.

[derSteFfi]

you seem to be right: google/tcmalloc#262

That bench.sh does not realize this case is on my list, just wanted to have #246 merged first...

[Yasaswinig7]

FYI, a shared library generated by adding a new rule in tcmalloc/BUILD (without modifying any other file with sed/awk) seems to be working (atleast for a small test).

file: tcmalloc/BUILD
cc_shared_library(
name = "tcmalloc_shared",
shared_lib_name = "libtcmalloc.so",
user_link_flags = ["-Wl,-soname,libtcmalloc.so"],
deps = [":tcmalloc"],
)

build cmd:
bazel build --copt "-flto" --linkopt "-flto=auto" //tcmalloc:tcmalloc_shared

unit test:
LD_PRELOAD=./bazel-bin/tcmalloc/libtcmalloc.so /bin/ls