MFC: r310712

• Use correct offsets into the keys set array. As the elements of this zero-length array are dynamically sized at run-time based on the use of hints, compilers can't be expected to figure out these offsets on their own. [1]
• Fix incorrect comparison in cmp_nans(). [2]

PR: 204571 [1], 202301 [2]
Submitted by: David Binderman [2]