Fix task_alignment for ARM

[blonded04]

Description

task_alignment seem to be (as git blame says) added to _task.h in 2019 when moving from TBB to oneTBB. However, it happens so that task_alignment is 64 bytes by default (x86 cacheline), which doesn't make any sense for ARM architectures with 128 bytes cacheline.

Fixes # - issue number(s) if exists

• - git commit message contains an appropriate signed-off-by string (see CONTRIBUTING.md for details)

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• bug fix - change that fixes an issue
• new feature - change that adds functionality
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• documentation - documentation update

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• added - required for new features and some bug fixes
• not needed

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Breaks backward compatibility

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[blonded04]

i decided to put #if here, instead of (task_alignment - sizeof(void*) - sizeof(task_traits)) / sizeof(std::uint64_t), because it gets weird on architectures where pointer isn't 8 bytes? idk, this seems cleaner than it was before

[pavelkumbrasev]

This patch might introduce backward compatibility problems so it should be carefully investigated.
Have you seen any performance improvements with this change?

[blonded04]

This patch might introduce backward compatibility problems so it should be carefully investigated. Have you seen any performance improvements with this change?

I tried to come up with some benchmarks with different variations of system topology, however, no difference is spotted :(