Set DOTNET_ReadyToRun to 0 in the debugger when disabling R2R

The debugger still sets the older `COMPlus_ReadyToRun` environment variable for older CoreCLR runtimes.

Author: ElektroKill

Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/Impl/DbgEngineImpl.cs

@@ -752,8 +752,10 @@ void StartCore(CorDebugStartDebuggingOptions options) {
 				if (debuggerSettings.SuppressJITOptimization_SystemModules) {
 					if (options is DotNetFrameworkStartDebuggingOptions)
 						env.Add("COMPlus_ZapDisable", "1");
-					else if (options is DotNetStartDebuggingOptions)
+					else if (options is DotNetStartDebuggingOptions) {
 						env.Add("COMPlus_ReadyToRun", "0");
+						env.Add("DOTNET_ReadyToRun", "0");
+					}
 					else
 						Debug.Fail("Unreachable code");
 				}