Adjust a literal in AtomicHashMap.h to be correctly sized
Adjust a literal in AtomicHashMap.h to be correctly sized

Summary: Noticed because of a warning emitted by MSVC, this fixees the literal for `kLockedPtr_` to correctly be 64-bits under MSVC, rather than 32-bit.
Closes #245

Reviewed By: @yfeldblum

Differential Revision: D2282806

Pulled By: @sgolemon

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