Better codegen for '<expression> === void <literal>'.

src/full-codegen.cc

Index: src/full-codegen.cc
diff --git a/src/full-codegen.cc b/src/full-codegen.cc
index 9353ab515617006609013744cb2035b04d38eae1..a243ca5cc76b8cbe247b0737d400d723316fe5e0 100644
--- a/src/full-codegen.cc
+++ b/src/full-codegen.cc
@@ -1290,6 +1290,26 @@ int FullCodeGenerator::TryCatch::Exit(int stack_depth) {
 }
 
 
+bool FullCodeGenerator::TryLiteralCompare(CompareOperation* compare,
+                                          Label* if_true,
+                                          Label* if_false,
+                                          Label* fall_through) {
+  Expression *expr;
+  Handle<String> check;
+  if (compare->IsLiteralCompareTypeof(&expr, &check)) {
+    EmitLiteralCompareTypeof(expr, check, if_true, if_false, fall_through);
+    return true;
+  }
+
+  if (compare->IsLiteralCompareUndefined(&expr)) {
+    EmitLiteralCompareUndefined(expr, if_true, if_false, fall_through);
+    return true;
+  }
+
+  return false;
+}
+
+
 #undef __