Revert changes causing layout failures

Summary: Revert changes to flex-basis as it broke some specific layouts. Will update later with a more comprehensive set of tests

Differential Revision: D3776987

fbshipit-source-id: 06bd154a36f895782f45511cd8cf49cc6d7cbe7d

CSSLayout/CSSLayout.c

@@ -1040,7 +1040,8 @@ static void layoutNodeImpl(const CSSNodeRef node,
         child->layout.computedFlexBasis =
             fmaxf(child->style.dimensions[CSSDimensionHeight],
                   getPaddingAndBorderAxis(child, CSSFlexDirectionColumn));
-      } else if (!CSSValueIsUndefined(child->style.flexBasis)) {
+      } else if (!CSSValueIsUndefined(child->style.flexBasis) &&
+                 !CSSValueIsUndefined(availableInnerMainDim)) {
         child->layout.computedFlexBasis =
             fmaxf(child->style.flexBasis, getPaddingAndBorderAxis(child, mainAxis));
       } else {