Spencer Ahrens d220118dbd Freeze UTFSequence
Summary:
Don't want anyone accidentally mutating it.

Also make deepFreezeAndThrowOnMutationInDev easier to use with nice flow typing.

Reviewed By: yungsters

Differential Revision: D6974089

fbshipit-source-id: 0f90e7939cb726893fa353a4f2a6bbba701205bc
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