Fix UBSan issue

[dnmokhov]

Description

UBSan reports an error if we try to downcast a misaligned address. To avoid it, we need to check if an address is valid before casting it.

Here is the UBSan error:

concurrent_hash_map.h:470:62: runtime error: downcast of misaligned address 0x000000000003 for type 'node' (aka 'tbb::detail::d2::concurrent_hash_map<int, int>::node'), which requires 8 byte alignment
0x000000000003: note: pointer points here
<memory cannot be printed>
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior concurrent_hash_map.h:470:62

Fixes #1601

Type of change

• bug fix - change that fixes an issue
• new feature - change that adds functionality
• tests - change in tests
• infrastructure - change in infrastructure and CI
• documentation - documentation update

Tests

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

Documentation

• updated in # - add PR number
• needs to be updated
• not needed

Breaks backward compatibility

• Yes
• No
• Unknown

[kboyarinov]

LGTM