This change addresses a rare CoreCLR crash in generic dictionary/method resolution caused by racing publication of dictionary layout pointers. The fix makes both publication and observation of those pointers use volatile semantics in the affected EEClass and InstantiatedMethodDesc paths.

• Dictionary layout publication

  • Switch EEClass::SetDictionaryLayout and InstantiatedMethodDesc::IMD_SetDictionaryLayout to VolatileStore.
  • This makes layout expansion visible to concurrent readers with the expected release semantics.

• Dictionary layout reads

  • Switch EEClass::GetDictionaryLayout, InstantiatedMethodDesc::IMD_GetDictionaryLayout, and InstantiatedMethodDesc::GetDictLayoutRaw to VolatileLoad.
  • This removes the remaining raw read path for m_pDictLayout, so all readers participate in the same publication protocol.

• Scope

  • The change is intentionally narrow: only the layout pointer accessors were updated.
  • No behavior outside dictionary layout publication/consumption is changed.

return HasOptionalFields() ? VolatileLoad(&GetOptionalFields()->m_pDictLayout) : NULL;

// ...

VolatileStore(&pIMD->m_pDictLayout, pNewLayout);