[committed] Fix atomic_capture-1.f90 testcase

Andrew Stubbs ams@codesourcery.com
Wed Nov 25 14:02:30 GMT 2020

This libgomp OpenACC testcase makes assumptions about the order in which 
loop iterations will run that are invalid on amdgcn. Apparently nvptx 
does work that way, but I find that surprising in itself.

For example, this patch ensures that where a test expects one bit left 
set, or unset, then it doesn't matter which bit it is.

Committed as obvious. Please revert if that turns out not true.

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