Mpk protect

[rubensturm1]

_mi_prim_thread_associate_default_heap unnecessarily sets heap in thread local data using pthread_setspecific even if MI_TLS_PTHREAD is not defined, while mi_prim_get_default_heap only uses mi_prim_get_default_heap if MI_TLS_PTHREAD is defined.

[microsoft-github-policy-service]

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