Implement partial loadUnaligned
Summary: Neither GCC or Clang are able to optimize a `memcpy` where the length is known to be smaller than a word: a library call is generated. This is a simple implementation of a subword `loadUnaligned` to be used to read the tail of a buffer when reading one word at a time. Reviewed By: luciang Differential Revision: D7631978 fbshipit-source-id: d5719580e6bef82aa8e3fbdce8f873b569527a3a
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