HUM-575 Couple of small EC GET optimization
HUM-575 Couple of small EC GET optimization

While doing GET call for EC objects, we might get better performance if we use
ReconstructData instead of Reconstruct.
https://github.com/klauspost/reedsolomon#performance

Also while doing Reconstruct/ReconstructData we could shave off one allocation
if we use zero-length buffer with adequate capacity instead of passing nil.

troubling/hummingbird,redbo/hummingbird,creiht/hummingbird,redbo/hummingbird,nadeemsyed/hummingbird,creiht/hummingbird,troubling/hummingbird,corystone/hummingbird,corystone/hummingbird,nadeemsyed/hummingbird