small modification of lz4 decoder to shortcut common case (short branch).
small modification of lz4 decoder to shortcut common case (short branch).

unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso