[1.0-beta4] Use our own hardware_destructive_interference_sz to avoid GCC warning

[heifner]

Avoid GCC warning:

libraries/chain/include/eosio/chain/thread_utils.hpp:28:15: warning: use of ‘std::hardware_destructive_interference_size’ [-Winterference-size]
   28 |       alignas(hardware_destructive_interference_size)
      |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
libraries/chain/include/eosio/chain/thread_utils.hpp:28:15: note: its value can vary between compiler versions or with different ‘-mtune’ or ‘-mcpu’ flags
libraries/chain/include/eosio/chain/thread_utils.hpp:28:15: note: if this use is part of a public ABI, change it to instead use a constant variable you define
libraries/chain/include/eosio/chain/thread_utils.hpp:28:15: note: the default value for the current CPU tuning is 64 bytes
libraries/chain/include/eosio/chain/thread_utils.hpp:28:15: note: you can stabilize this value with ‘--param hardware_destructive_interference_size=64’, or disable this warning with ‘-Wno-interference-size’

Declare and use our own hardware_destructive_interference_size set to 64 which should be sufficient for our supported platforms. Rename to hardware_destructive_interference_sz to avoid confusing with std::hardware_destructive_interference_size.

See also #41

[spoonincode]

indentation here only 2 spaces

[heifner]

Fixed

[ericpassmore]

Note:start
group: CLEANCODE
category: INTERNALS
summary: Use our own hardware_destructive_interference_sz to avoid GCC warning.
Note:end