If running in cpu-only mode, don't register malloc_hooks?

[NHDaly]

In our production deployment, we do not want to use malloc_hooks. We are swapping out our malloc implementation with a different library, and these do not play well together.

We are not using the allocation profiles anyway. We could run with --preset cpu_only, but it looks like the hooks are currently registered unconditionally:

ddprof/src/lib/symbol_overrides.cc

Line 892 in bccb05d

register_hook<MallocxHook>();

Could we please change the malloc hooks to only be registered if allocation profiling is enabled? 🙏

Thank you!

CC: @d-netto