ARROW-5770: [C++] Fix -Wpessimizing-move in result.h
ARROW-5770: [C++] Fix -Wpessimizing-move in result.h

Author: Micah Kornfield <emkornfield@gmail.com>

Closes #4733 from emkornfield/remove_std_move and squashes the following commits:

ad1b1fc99 <Micah Kornfield> ARROW-5770: Fix -Wpessimizing-move in result.h

majetideepak/arrow,cpcloud/arrow,wesm/arrow,wesm/arrow,kou/arrow,wesm/arrow,cpcloud/arrow,renesugar/arrow,renesugar/arrow,icexelloss/arrow,xhochy/arrow,wesm/arrow,xhochy/arrow,apache/arrow,renesugar/arrow,xhochy/arrow,cpcloud/arrow,icexelloss/arrow,kou/arrow,xhochy/arrow,icexelloss/arrow,icexelloss/arrow,xhochy/arrow,apache/arrow,kou/arrow,majetideepak/arrow,laurentgo/arrow,majetideepak/arrow,icexelloss/arrow,kou/arrow,xhochy/arrow,kou/arrow,apache/arrow,renesugar/arrow,laurentgo/arrow,majetideepak/arrow,majetideepak/arrow,kou/arrow,cpcloud/arrow,laurentgo/arrow,apache/arrow,cpcloud/arrow,cpcloud/arrow,majetideepak/arrow,apache/arrow,icexelloss/arrow,renesugar/arrow,majetideepak/arrow,majetideepak/arrow,majetideepak/arrow,wesm/arrow,icexelloss/arrow,icexelloss/arrow,cpcloud/arrow,majetideepak/arrow,laurentgo/arrow,laurentgo/arrow,apache/arrow,laurentgo/arrow,majetideepak/arrow,wesm/arrow,kou/arrow,apache/arrow,renesugar/arrow,majetideepak/arrow,cpcloud/arrow,cpcloud/arrow,cpcloud/arrow,renesugar/arrow,xhochy/arrow,icexelloss/arrow,cpcloud/arrow,renesugar/arrow,renesugar/arrow,renesugar/arrow,wesm/arrow,icexelloss/arrow,cpcloud/arrow,wesm/arrow,apache/arrow,laurentgo/arrow,apache/arrow,laurentgo/arrow,kou/arrow,majetideepak/arrow,laurentgo/arrow,majetideepak/arrow,apache/arrow,apache/arrow,kou/arrow,wesm/arrow,icexelloss/arrow,kou/arrow,renesugar/arrow,xhochy/arrow,icexelloss/arrow,xhochy/arrow,kou/arrow,cpcloud/arrow,xhochy/arrow,kou/arrow,wesm/arrow,apache/arrow,laurentgo/arrow,icexelloss/arrow,renesugar/arrow,majetideepak/arrow,xhochy/arrow,kou/arrow,apache/arrow,xhochy/arrow,laurentgo/arrow,xhochy/arrow,apache/arrow,laurentgo/arrow,laurentgo/arrow,xhochy/arrow,wesm/arrow,wesm/arrow,laurentgo/arrow,renesugar/arrow,icexelloss/arrow,laurentgo/arrow,xhochy/arrow,cpcloud/arrow,renesugar/arrow,wesm/arrow,wesm/arrow,kou/arrow,renesugar/arrow