fix #29585, implement equality for tearoffs

pkg/dev_compiler/lib/src/compiler/code_generator.dart

Index: pkg/dev_compiler/lib/src/compiler/code_generator.dart
diff --git a/pkg/dev_compiler/lib/src/compiler/code_generator.dart b/pkg/dev_compiler/lib/src/compiler/code_generator.dart
index 3b7e5e927effbf4c1e1bb2a9b071f99959e57e78..6fca9c6b0406560a069a717630c67dcfb229f2d1 100644
--- a/pkg/dev_compiler/lib/src/compiler/code_generator.dart
+++ b/pkg/dev_compiler/lib/src/compiler/code_generator.dart
@@ -3782,7 +3782,7 @@ class CodeGenerator extends Object
 
       // TODO(vsm): Constructors in dart:html and friends are trying to
       // allocate a type defined on window/self, but this often conflicts a
-      // with the generated extenstion class in scope.  We really should
+      // with the generated extension class in scope.  We really should
       // qualify explicitly in dart:html itself.
       var constructorPattern = new RegExp("new [A-Z][A-Za-z]+\\(");
       if (constructorPattern.matchAsPrefix(source) != null) {