Fix missing enum values in switch statements (xplat/js)

Summary:
Make improvements so that it is safe to use the `-Wswitch-enum` compiler error in a project consuming RN

Changelog: [iOS] [Fixed] - Improve support for projects with `-Wswitch-enum` compiler error

Differential Revision: D86026884

fbshipit-source-id: 0407cc24d39d8da3badcc38a890b1dcff4b8f10c

Author: NSProgrammer

yoga/style/StyleLength.h

@@ -74,7 +74,14 @@ class StyleLength {
   }
 
   constexpr FloatOptional resolve(float referenceLength) {
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wswitch-enum"
+#endif
     switch (unit_) {
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
       case Unit::Point:
         return value_;
       case Unit::Percent:

yoga/style/StyleSizeLength.h

@@ -99,7 +99,14 @@ class StyleSizeLength {
   }
 
   constexpr FloatOptional resolve(float referenceLength) {
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wswitch-enum"
+#endif
     switch (unit_) {
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
       case Unit::Point:
         return value_;
       case Unit::Percent: