Dart SDK Spelling b, c, and d.

tests/corelib/regexp/regress-regexp-codeflush_test.dart

Index: tests/corelib/regexp/regress-regexp-codeflush_test.dart
diff --git a/tests/corelib/regexp/regress-regexp-codeflush_test.dart b/tests/corelib/regexp/regress-regexp-codeflush_test.dart
index ee416347f2829af08096955f751707e151f8a6d5..03b0804e1dd24a26c840d5ee9791a9e02f71afd4 100644
--- a/tests/corelib/regexp/regress-regexp-codeflush_test.dart
+++ b/tests/corelib/regexp/regress-regexp-codeflush_test.dart
@@ -36,7 +36,7 @@ void main() {
   // internally calls RegExpImpl::IrregexpExecOnce more than once without
   // ensuring that the regexp is compiled.
   // This can create a crash if the code was exchanged with the sweep
-  // generation (for code flushing support) in GC durring the matching.
+  // generation (for code flushing support) in GC during the matching.
 
   var re = new RegExp('(s)');