Add some hefty padding to reported image required size on AMD. Refs #795
Add some hefty padding to reported image required size on AMD. Refs #795

* AMD reports image required sizes with some variation even for the same
  creation parameters. This can mean the same image is reported with
  less required size during capture compared to replay, meaning memory
  binds won't work.
* To get around this, we pad up the requirements to alignment * 4 and
  fudge to try and encompass any possible variation.

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