Summary:
fbcode build now support SSE instructions.
Delete older version of the compile-helper fbcode.sh. This is
subsumed by fbcode.gcc471.sh.

Test Plan: run make check

Reviewers: heyongqiang, MarkCallaghan

Reviewed By: heyongqiang

Differential Revision: https://reviews.facebook.net/D6057

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Summary:
This speeds up CRC computation significantly on
hardware that supports it. Enabled via -msse4.

Note: the binary won't be usable on older CPUs
that don't support the instruction.

Test Plan: crc32c_test

Reviewers: dhruba

Reviewed By: dhruba

Differential Revision: https://reviews.facebook.net/D3201

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Reviewers: chip

Reviewed By: chip

CC: sc, adsharma

Differential Revision: https://reviews.facebook.net/D3225