Fix characters in cs files

Author: slozier

src/core/IronPython/Compiler/Ast/BinaryExpression.cs

@@ -190,7 +190,7 @@ private class IsInstruction : BinaryInstruction {
             public static readonly IsInstruction Instance = new IsInstruction();
 
             public override int Run(InterpretedFrame frame) {
-                // it’s okay to pop the args in this order due to commutativity of referential equality
+                // it's okay to pop the args in this order due to commutativity of referential equality
                 frame.Push(PythonOps.Is(frame.Pop(), frame.Pop()));
                 return +1;
             }
@@ -200,7 +200,7 @@ private class IsNotInstruction : BinaryInstruction {
             public static readonly IsNotInstruction Instance = new IsNotInstruction();
 
             public override int Run(InterpretedFrame frame) {
-                // it’s okay to pop the args in this order due to commutativity of referential equality
+                // it's okay to pop the args in this order due to commutativity of referential equality
                 frame.Push(PythonOps.IsNot(frame.Pop(), frame.Pop()));
                 return +1;
             }

src/core/IronPython/Compiler/Ast/FlowChecker.cs

@@ -15,7 +15,7 @@
  * The only difference between the two is behavior on delete.
  * On delete, the name is not assigned to meaningful value (we need to check at runtime if it's initialized),
  * but it is not uninitialized either (because delete statement will set it to Uninitialized.instance).
- * This way, codegen doesn’t have to emit an explicit initialization for it.
+ * This way, codegen doesn't have to emit an explicit initialization for it.
  * 
  * Consider:
  *