Add errata supporting changes to position: static (#1434)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1434

X-link: https://github.com/facebook/react-native/pull/41130

I will use this errata to gate my changes that actually make position: static behave like the web. We have future plans to make position: relative the default again but users could still have declared certain nodes as position: static, so I think this is needed regardless.

Reviewed By: NickGerleman

Differential Revision: D50506915

fbshipit-source-id: b0d9e6883167de6ff002352c9288053324464cb9

yoga/YGEnums.cpp

@@ -97,6 +97,8 @@ const char* YGErrataToString(const YGErrata value) {
       return "stretch-flex-basis";
     case YGErrataStartingEndingEdgeFromFlexDirection:
       return "starting-ending-edge-from-flex-direction";
+    case YGErrataPositionStaticBehavesLikeRelative:
+      return "position-static-behaves-like-relative";
     case YGErrataAll:
       return "all";
     case YGErrataClassic:

yoga/YGEnums.h

@@ -57,6 +57,7 @@ YG_ENUM_DECL(
     YGErrataNone = 0,
     YGErrataStretchFlexBasis = 1,
     YGErrataStartingEndingEdgeFromFlexDirection = 2,
+    YGErrataPositionStaticBehavesLikeRelative = 4,
     YGErrataAll = 2147483647,
     YGErrataClassic = 2147483646)
 YG_DEFINE_ENUM_FLAG_OPERATORS(YGErrata)

yoga/enums/Errata.h

@@ -19,6 +19,7 @@ enum class Errata : uint32_t {
   None = YGErrataNone,
   StretchFlexBasis = YGErrataStretchFlexBasis,
   StartingEndingEdgeFromFlexDirection = YGErrataStartingEndingEdgeFromFlexDirection,
+  PositionStaticBehavesLikeRelative = YGErrataPositionStaticBehavesLikeRelative,
   All = YGErrataAll,
   Classic = YGErrataClassic,
 };
@@ -27,7 +28,7 @@ YG_DEFINE_ENUM_FLAG_OPERATORS(Errata)
 
 template <>
 constexpr inline int32_t ordinalCount<Errata>() {
-  return 5;
+  return 6;
 } 
 
 template <>