Support -unsafe command for Roslyn Compiler

Author: veblush

core/IncrementalCompiler/CompileOptions.cs

@@ -30,6 +30,7 @@ public class CompileOptions
         [DataMember] public List<string> References = new List<string>();
         [DataMember] public List<string> Files = new List<string>();
         [DataMember] public List<string> NoWarnings = new List<string>();
+        [DataMember] public List<string> Options = new List<string>();
         [DataMember] public DebugSymbolFileType DebugSymbolFile;
         [DataMember] public PrebuiltOutputReuseType PrebuiltOutputReuse;
 
@@ -80,6 +81,10 @@ public void ParseArgument(string[] args)
                                     : id);
                             }
                             break;
+
+                        default:
+                            Options.Add(arg);
+                            break;
                     }
                 }
                 else if (arg.StartsWith("@"))

core/IncrementalCompiler/Compiler.cs

@@ -69,7 +69,8 @@ private CompileResult BuildFull(CompileOptions options)
                 _sourceMap.Values,
                 _referenceMap.Values,
                 new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary)
-                    .WithSpecificDiagnosticOptions(specificDiagnosticOptions));
+                    .WithSpecificDiagnosticOptions(specificDiagnosticOptions)
+                    .WithAllowUnsafe(options.Options.Contains("-unsafe")));
 
             Emit(result);