Find a new home for RuntimeHelpers

Author: MichelZ

src/Microsoft.Data.SqlClient/netcore/src/RuntimeHelpers.cs renamed to src/Microsoft.Data.SqlClient/netcore/src/Common/System/Runtime/CompilerServicesOverride/RuntimeHelpers.cs

@@ -1,6 +1,6 @@
 using System.Diagnostics;
 
-namespace Microsoft.Data.SqlClient
+namespace System.Runtime.CompilerServicesOverride
 {
     internal struct RuntimeHelpers
     {

src/Microsoft.Data.SqlClient/netcore/src/Microsoft.Data.SqlClient.csproj

@@ -637,6 +637,7 @@
     <Compile Include="Common\System\Net\Security\SecurityBufferType.cs" />
     <Compile Include="Common\System\Net\SecurityStatusPal.cs" />
     <Compile Include="Common\System\Threading\Tasks\TaskToApm.cs" />
+    <Compile Include="Common\System\Runtime\CompilerServicesOverride\RuntimeHelpers.cs" />
     <Compile Include="Interop\SNINativeMethodWrapper.Common.cs" />
     <Compile Include="Microsoft\Data\Common\DbConnectionOptions.cs" />
     <Compile Include="Microsoft\Data\SqlClient\LocalDBAPI.cs" />
@@ -683,7 +684,6 @@
     <Compile Include="Microsoft\Data\SqlClient\TdsParserStateObjectManaged.cs" />
     <Compile Include="Microsoft\Data\SqlTypes\SqlTypeWorkarounds.netcore.cs" />
     <Compile Include="Microsoft.Data.SqlClient.TypeForwards.cs" />
-    <Compile Include="RuntimeHelpers.cs" />
   </ItemGroup>
 
   <!-- Windows only -->

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SqlDataReader.cs

@@ -13,6 +13,7 @@
 using System.Globalization;
 using System.IO;
 using System.Reflection;
+using RuntimeHelpers = System.Runtime.CompilerServicesOverride.RuntimeHelpers;
 using System.Runtime.CompilerServices;
 using System.Text;
 using System.Text.Json;

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/TdsParserStateObject.netcore.cs

@@ -5,6 +5,7 @@
 using System;
 using System.Diagnostics;
 using System.Buffers.Binary;
+using System.Runtime.CompilerServicesOverride;
 using System.Runtime.InteropServices;
 using System.Security;
 using System.Threading;

src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/TdsParserStateObject.cs

@@ -17,8 +17,10 @@ namespace Microsoft.Data.SqlClient
 #if NETFRAMEWORK
     using PacketHandle = IntPtr;
     using RuntimeHelpers = System.Runtime.CompilerServices.RuntimeHelpers;
+#else
+    using System.Runtime.CompilerServicesOverride;
 #endif
-
+    
     sealed internal class LastIOTimer
     {
         internal long _value;