Revert "Avoid "=== true" inside code by calling a function that does this for us."

frog/tests/leg/src/ConstantFoldingTest.dart

Index: frog/tests/leg/src/ConstantFoldingTest.dart
diff --git a/frog/tests/leg/src/ConstantFoldingTest.dart b/frog/tests/leg/src/ConstantFoldingTest.dart
index 9a05a14362fcc78ebceb2e4d4c63e15a70b99e8f..e03221063d3dbfdb27c50f1e1c382235348cc5dd 100644
--- a/frog/tests/leg/src/ConstantFoldingTest.dart
+++ b/frog/tests/leg/src/ConstantFoldingTest.dart
@@ -37,7 +37,7 @@ main() {
       NEGATIVE_NUMBER_FOLDING, 'main', const RegExp(@"print\(1\)"));
 
   String generated = compile(NULL_EQUALS_FOLDING, 'foo');
-  RegExp regexp = const RegExp(@'eqNullB\(a\)');
+  RegExp regexp = const RegExp(@'eqNull\(a\)');
   Expect.isTrue(regexp.hasMatch(generated));
 
   regexp = const RegExp(@'\(?void 0\)? === b');