swift

439f7382 - [Windows] Fix MSVC C4250 warnings

[Windows] Fix MSVC C4250 warnings Override inherited virtual methods explicitly in TemporaryInitialization (SILGen) and the Sync*EntryPointArgumentEmission classes (IRGen) so MSVC no longer warns about inheritance via dominance. - Remove redundant using-declarations in SyncNativeCCEntryPointArgumentEmission