perf: use jemalloc as the global allocator on unix (try 2)

[DaniPopes]

We should be able to enable this on unix and x64. Cannot enable on:

• anvil: parity dependencies have something cursed going on that depend on the global allocator being the system one, otherwise it segfaults
  • Keep getting segfaults on anvil #5754
  • Anvil crashes when using the block-time flag #5756
• linux arm: incompatible page sizes, macos arm should be fine
  • jemalloc breaks foundry build process for systems with unsupported page sizes  #5832

[onbjerg]

linux arm: incompatible page sizes

this is not strictly true. where do we depend on the page size?

also: "The architecture allows up to 4 levels of translation tables with a 4KB page size and up to 3 levels with a 64KB page size." (4kb 4 layers is the same as x86) https://docs.kernel.org/arch/arm64/memory.html

[DaniPopes]

I don't know, I just know that aarch64 mostly breaks if we enable jemalloc on it, as per many reth issues and the linked issue

[onbjerg]

as per many reth issues

this is a special case for reth because we exhaust the virtual address space on some arm architectures, this should not be the case for foundry

[DaniPopes]

It's not about exhausting any address space, it straight up just does not work, see

• jemalloc breaks foundry build process for systems with unsupported page sizes  #5832
• Problem with jemalloc on system with larger page size paradigmxyz/reth#6742