Summary:
Avoid recalculating margin and padding by pre-subtracting the margin from `availableWidth` and inlining the calculation of `paddingAndBorderAxisCross`.
Changelog: [Internal]
Reviewed By: SidharthGuglani
Differential Revision: D27010094
fbshipit-source-id: afc3cf251a0306b9e5d7f0dc6856feee8d1dca6e