Experimental parser: add a test file for unicode newlines.

test/lexer/cornercases/utf-endlines.js

Index: test/lexer/cornercases/utf-endlines.js
diff --git a/src/hydrogen-check-elimination.h b/test/lexer/cornercases/utf-endlines.js
similarity index 68%
copy from src/hydrogen-check-elimination.h
copy to test/lexer/cornercases/utf-endlines.js
index fa01964f6faf091c3f2504b6d2cfe416e0a09b16..8ac1ee2fa895d691403ed0f6865a7dfd312b9a8c 100644
--- a/src/hydrogen-check-elimination.h
+++ b/test/lexer/cornercases/utf-endlines.js
@@ -25,28 +25,31 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#ifndef V8_HYDROGEN_CHECK_ELIMINATION_H_
-#define V8_HYDROGEN_CHECK_ELIMINATION_H_
+// The "-->" at the beginning of a line is a weird SpiderMonkey compatibility
+// hack.
 
-#include "hydrogen.h"
+// This file tests if it's recognized after various Unicode new line markers:
 
-namespace v8 {
-namespace internal {
+"Line feed":
+--> break
 
+// Vertical tab is not recognized as a newline.
+"Vertical tab":--> case
 
-// Remove CheckMaps instructions through flow- and branch-sensitive analysis.
-class HCheckEliminationPhase : public HPhase {
- public:
-  explicit HCheckEliminationPhase(HGraph* graph)
-      : HPhase("H_Check Elimination", graph) { }
+// Form feed is not recognized as a newline.
+"Form feed":--> catch
 
-  void Run();
+"Carriage return":
--> const
 
- private:
-  void EliminateLocalChecks(HBasicBlock* block);
-};
+"Carriage return and line feed:"
+--> continue
 
+// Next line is not regonized as a newline, instead it's recognized as an identifier.
+"Next line":…
+--> debugger
 
-} }  // namespace v8::internal
+// Line separator is not recognized as a newline, instead it's ILLEGAL.
+//"Line separator":
--> default
 
-#endif  // V8_HYDROGEN_CHECK_ELIMINATION_H_
+// Paragraph separator is not recognized as a newline, instead it's ILLEGAL.
+//"Paragraph separator":
--> delete