Fix RS1026 (Enable concurrent execution)

Author: sharwell

StyleCop.Analyzers/StyleCop.Analyzers.Test/AnalyzerExtensionsTests.cs

@@ -70,6 +70,7 @@ public AnalyzerExtensionsTests AnalyzerExtensionsTests
             public override void Initialize(AnalysisContext context)
             {
                 context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.None);
+                context.EnableConcurrentExecution();
 
                 context.RegisterCompilationStartAction(
                     compilationStartContext =>

StyleCop.Analyzers/StyleCop.Analyzers.Test/SpecialRules/SA0002UnitTests.cs

@@ -412,6 +412,10 @@ public override void RegisterSyntaxTreeAction(Action<SyntaxTreeAnalysisContext>
             public override void ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags analysisMode)
             {
             }
+
+            public override void EnableConcurrentExecution()
+            {
+            }
         }
     }
 }

StyleCop.Analyzers/StyleCop.Analyzers.Test/Verifiers/DiagnosticVerifierTests.cs

@@ -426,6 +426,7 @@ private class ErrorThrowingAnalyzer : SA1002SemicolonsMustBeSpacedCorrectly
             public override void Initialize(AnalysisContext context)
             {
                 context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.None);
+                context.EnableConcurrentExecution();
 
                 context.RegisterSyntaxNodeAction(BlockAction, SyntaxKind.Block);
             }

StyleCop.Analyzers/StyleCop.Analyzers/NamingRules/SA1301ElementMustBeginWithLowerCaseLetter.cs

@@ -39,6 +39,7 @@ internal class SA1301ElementMustBeginWithLowerCaseLetter : DiagnosticAnalyzer
         public override void Initialize(AnalysisContext context)
         {
             context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.None);
+            context.EnableConcurrentExecution();
 
             // Intentionally empty
         }

StyleCop.Analyzers/StyleCop.Analyzers/ReadabilityRules/SA1139UseLiteralSuffixNotationInsteadOfCasting.cs

@@ -41,6 +41,7 @@ internal class SA1139UseLiteralSuffixNotationInsteadOfCasting : DiagnosticAnalyz
         public override void Initialize(AnalysisContext context)
         {
             context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.None);
+            context.EnableConcurrentExecution();
             context.RegisterCompilationStartAction(CompilationStartAction);
         }
 

StyleCop.Analyzers/StyleCop.Analyzers/SpecialRules/SA0002InvalidSettingsFile.cs

@@ -39,6 +39,7 @@ internal class SA0002InvalidSettingsFile : DiagnosticAnalyzer
         public override void Initialize(AnalysisContext context)
         {
             context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.None);
+            context.EnableConcurrentExecution();
 
             context.RegisterCompilationAction(CompilationAction);
         }