let Value be nothrow-move-constructible (#47422)

Summary: Pull Request resolved: facebook/react-native#47422

Reviewed By: Gownta

Differential Revision: D65273055

fbshipit-source-id: 6fda316137b1f797b8b4041521555e46e1098e7c

API/jsi/jsi/jsi.cpp

@@ -333,7 +333,7 @@ Function Object::asFunction(Runtime& runtime) && {
   return std::move(*this).getFunction(runtime);
 }
 
-Value::Value(Value&& other) : Value(other.kind_) {
+Value::Value(Value&& other) noexcept : Value(other.kind_) {
   if (kind_ == BooleanKind) {
     data_.boolean = other.data_.boolean;
   } else if (kind_ == NumberKind) {

API/jsi/jsi/jsi.h

@@ -1121,7 +1121,7 @@ class JSI_EXPORT Function : public Object {
 class JSI_EXPORT Value {
  public:
   /// Default ctor creates an \c undefined JS value.
-  Value() : Value(UndefinedKind) {}
+  Value() noexcept : Value(UndefinedKind) {}
 
   /// Creates a \c null JS value.
   /* implicit */ Value(std::nullptr_t) : kind_(NullKind) {}
@@ -1162,7 +1162,7 @@ class JSI_EXPORT Value {
         "Value cannot be constructed directly from const char*");
   }
 
-  Value(Value&& value);
+  Value(Value&& other) noexcept;
 
   /// Copies a Symbol lvalue into a new JS value.
   Value(Runtime& runtime, const Symbol& sym) : Value(SymbolKind) {
@@ -1217,7 +1217,7 @@ class JSI_EXPORT Value {
   /// https://262.ecma-international.org/11.0/#sec-strict-equality-comparison
   static bool strictEquals(Runtime& runtime, const Value& a, const Value& b);
 
-  Value& operator=(Value&& other) {
+  Value& operator=(Value&& other) noexcept {
     this->~Value();
     new (this) Value(std::move(other));
     return *this;