ARROW-5362: [C++] Fix compression test memory usage
ARROW-5362: [C++] Fix compression test memory usage

Author: Micah Kornfield <emkornfield@gmail.com>

Closes #4335 from emkornfield/fix_compression_tests and squashes the following commits:

86ddd9963 <Micah Kornfield> revert cmopressed size
e37f8ad55 <Micah Kornfield> Change back to using resize
9b51c5809 <Micah Kornfield> ARROW-5362: Fix compression test memory usage

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