Add NativeProfiled attribute (#227)

***NO_CI***

Author: josesimoes

nanoFramework.CoreLibrary.NoReflection/CoreLibrary.NoReflection.nfproj

@@ -303,6 +303,9 @@
     <NFMDP_PE_ExcludeClassByName Include="System.Diagnostics.DebuggerTypeProxyAttribute">
       <InProject>false</InProject>
     </NFMDP_PE_ExcludeClassByName>
+    <NFMDP_PE_ExcludeClassByName Include="System.Diagnostics.NativeProfiledAttribute">
+      <InProject>false</InProject>
+    </NFMDP_PE_ExcludeClassByName>
     <NFMDP_PE_ExcludeClassByName Include="System.FlagsAttribute">
       <InProject>false</InProject>
     </NFMDP_PE_ExcludeClassByName>

nanoFramework.CoreLibrary/CoreLibrary.nfproj

@@ -66,6 +66,7 @@
     <Compile Include="System\AppDomainUnloadedException.cs" />
     <Compile Include="System\ApplicationException.cs" />
     <Compile Include="System\ArgumentException.cs" />
+    <Compile Include="System\Diagnostics\NativeProfiledAttribute.cs" />
     <Compile Include="System\PlatformNotSupportedException.cs" />
     <Compile Include="System\ArgumentNullException.cs" />
     <Compile Include="System\ArgumentOutOfRangeException.cs" />
@@ -246,7 +247,7 @@
     </NFMDP_PE_ExcludeClassByName>
     <NFMDP_PE_ExcludeClassByName Include="System.Diagnostics.CodeAnalysis.DoesNotReturnAttribute">
       <InProject>false</InProject>
-    </NFMDP_PE_ExcludeClassByName>    
+    </NFMDP_PE_ExcludeClassByName>
     <NFMDP_PE_ExcludeClassByName Include="System.Diagnostics.CodeAnalysis.DoesNotReturnIfAttribute">
       <InProject>false</InProject>
     </NFMDP_PE_ExcludeClassByName>
@@ -295,6 +296,9 @@
     <NFMDP_PE_ExcludeClassByName Include="System.Diagnostics.DebuggerTypeProxyAttribute">
       <InProject>false</InProject>
     </NFMDP_PE_ExcludeClassByName>
+    <NFMDP_PE_ExcludeClassByName Include="System.Diagnostics.NativeProfiledAttribute">
+      <InProject>false</InProject>
+    </NFMDP_PE_ExcludeClassByName>
     <NFMDP_PE_ExcludeClassByName Include="System.FlagsAttribute">
       <InProject>false</InProject>
     </NFMDP_PE_ExcludeClassByName>

nanoFramework.CoreLibrary/System/Diagnostics/NativeProfiledAttribute.cs

@@ -0,0 +1,19 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Runtime.CompilerServices;
+
+namespace System.Diagnostics
+{
+    /// <summary>
+    /// Indicates that a method will profiled by the runtime, providing it has profiling capabilities enabled.
+    /// </summary>
+    /// <remarks>
+    /// This attribute is exclusive to the .NET nanoFramework runtime and has no effect on other runtimes.
+    /// </remarks>
+    [ExcludeType]
+    [DebuggerNonUserCode]
+    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor, Inherited = false)]
+    public sealed class NativeProfiledAttribute : Attribute
+    { }
+}