Reenable tests for fixed ProjectN bug (dotnet/corefx#30467)

The bug has been fixed in ProjectN 3 years ago.

Fixes dotnet/corefx#16747
Fixes dotnet/corefx#21198

Commit migrated from dotnet/corefx@7303e22

Author: jkotas

src/libraries/System.Dynamic.Runtime/tests/Dynamic.Context/Conformance.dynamic.context.indexer.genclass.cs

@@ -827,7 +827,6 @@ public class Test
         private static int s_num = 0;
 
         [Fact]
-        [ActiveIssue(16747)]
         public static void DynamicCSharpRunTest()
         {
             Assert.Equal(0, MainMethod());

src/libraries/System.Linq.Expressions/tests/Lambda/LambdaTests.cs

@@ -55,8 +55,8 @@ public void Lambda(bool useInterpreter)
             Assert.Equal("(i, j, k, l) => i", lambda.ToString());
         }
 
-        // Possible issue with AOT? See https://github.com/dotnet/corefx/pull/8116/files#r61346743
-        [Theory(Skip = "870811"), ClassData(typeof(CompilationTypes))]
+        [Theory, ClassData(typeof(CompilationTypes))]
+        [ActiveIssue(30471)]
         public void InvokeComputedLambda(bool useInterpreter)
         {
             ParameterExpression x = Expression.Parameter(typeof(int), "x");

src/libraries/System.Linq.Expressions/tests/SequenceTests/SequenceTests.cs

@@ -642,7 +642,7 @@ public class AndAlso
             public override string ToString() { return value.ToString(); }
         }
 
-        [Theory(Skip = "870811")]
+        [Theory]
         [ClassData(typeof(CompilationTypes))]
         public static void TestAndAlso(bool useInterpreter)
         {
@@ -967,7 +967,7 @@ private class AnonHelperClass1
             public AnonHelperClass1(Expression<Func<decimal>> mem1) { this.mem1 = mem1; }
         }
 
-        [Theory(Skip = "870811")]
+        [Theory]
         [ClassData(typeof(CompilationTypes))]
         public static void NewExpressionwithMemberAssignInit(bool useInterpreter)
         {
@@ -1834,7 +1834,7 @@ public static void StaticMethodCall(bool useInterpreter)
             Assert.Equal(4, d(3, 4));
         }
 
-        [Theory(Skip = "870811")]
+        [Theory]
         [ClassData(typeof(CompilationTypes))]
         public static void CallOnCapturedInstance(bool useInterpreter)
         {
@@ -1900,7 +1900,7 @@ public static void ArrayInitializedWithLiterals(bool useInterpreter)
             Assert.Equal(5, v.Length);
         }
 
-        [Theory(Skip = "870811")]
+        [Theory]
         [ClassData(typeof(CompilationTypes))]
         public static void ArrayInitializedWithCapturedInstance(bool useInterpreter)
         {