Add OSPlatform.Browser and Architecture.Wasm (#34781)

Author: lewing

src/libraries/System.Runtime.InteropServices.RuntimeInformation/ref/System.Runtime.InteropServices.RuntimeInformation.cs

@@ -13,11 +13,13 @@ public enum Architecture
         X64 = 1,
         Arm = 2,
         Arm64 = 3,
+        Wasm = 4,
     }
     public readonly partial struct OSPlatform : System.IEquatable<System.Runtime.InteropServices.OSPlatform>
     {
         private readonly object _dummy;
         private readonly int _dummyPrimitive;
+        public static System.Runtime.InteropServices.OSPlatform Browser { get { throw null; } }
         public static System.Runtime.InteropServices.OSPlatform FreeBSD { get { throw null; } }
         public static System.Runtime.InteropServices.OSPlatform Linux { get { throw null; } }
         public static System.Runtime.InteropServices.OSPlatform OSX { get { throw null; } }

src/libraries/System.Runtime.InteropServices.RuntimeInformation/src/System/Runtime/InteropServices/RuntimeInformation/Architecture.cs

@@ -9,6 +9,7 @@ public enum Architecture
         X86,
         X64,
         Arm,
-        Arm64
+        Arm64,
+        Wasm
     }
 }

src/libraries/System.Runtime.InteropServices.RuntimeInformation/src/System/Runtime/InteropServices/RuntimeInformation/OSPlatform.cs

@@ -8,6 +8,8 @@ namespace System.Runtime.InteropServices
     {
         private readonly string _osPlatform;
 
+        public static OSPlatform Browser { get; } = new OSPlatform("BROWSER");
+
         public static OSPlatform FreeBSD { get; } = new OSPlatform("FREEBSD");
 
         public static OSPlatform Linux { get; } = new OSPlatform("LINUX");