Improve dead code elimination by transitively marking live code and removing all dead code. Replace…

test/mjsunit/compiler/dead-code2.js

Index: test/mjsunit/compiler/dead-code2.js
diff --git a/test/mjsunit/regress/regress-1114040.js b/test/mjsunit/compiler/dead-code2.js
similarity index 60%
copy from test/mjsunit/regress/regress-1114040.js
copy to test/mjsunit/compiler/dead-code2.js
index 9d1b320a9a298f36db0c9915687d48951f9e5450..b0580207edb8c1d3905fc20b88b4706905578420 100644
--- a/test/mjsunit/regress/regress-1114040.js
+++ b/test/mjsunit/compiler/dead-code2.js
@@ -25,34 +25,60 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-function TestBreak() {
-  var sequence = "";
-  for (var a in [0,1]) {
-    L: {
-      for (var b in [2,3,4]) {
-        break L;
-      }
+function dead1(a, b) {
+    { var x = a + b; }
+    return a; // x is dead
+}
+
+function dead2(a, b) {
+    { var x = a | 0; var y = b | 0; }
+    return a; // x and y are both dead
+}
+
+function dead3(a, b) {
+    {
+      var z;
+      if(a == 2) z = a;
+      else z = b;
     }
-    sequence += a;
-  }
-  return sequence;
+    return a; // z is dead
 }
 
+function dead4(a) {
+    {
+      var z = 3;
+      for (i = 0; i < 3; i++) {
+        z++;
+      }
+    }
+    return a; // z is dead
+}
 
-function TestContinue() {
-  var sequence = "";
-  for (var a in [0,1]) {
-    L: do {
-      for (var b in [2,3,4]) {
-        continue L;
+function dead5(a) {
+    {
+      var z = 3;
+      for (i = 0; i < 3; i++) {
+        z++;
       }
-    } while (false);
-    sequence += a;
-  }
-  return sequence;
+      var w = z + a;
+    }
+    return a; // z and w are dead
 }
 
+assertTrue(dead1(33, 32) == 33);
+assertTrue(dead2(33, 32) == 33);
+assertTrue(dead3(33, 32) == 33);
+assertTrue(dead4(33) == 33);
+assertTrue(dead5(33) == 33);
 
-assertEquals("01", TestBreak());
-assertEquals("01", TestContinue());
+assertTrue(dead1(34, 7) == 34);
+assertTrue(dead2(34, 7) == 34);
+assertTrue(dead3(34, 7) == 34);
+assertTrue(dead4(34) == 34);
+assertTrue(dead5(34) == 34);
 
+assertTrue(dead1(3.4, 0.1) == 3.4);
+assertTrue(dead2(3.4, 0.1) == 3.4);
+assertTrue(dead3(3.4, 0.1) == 3.4);
+assertTrue(dead4(3.4) == 3.4);
+assertTrue(dead5(3.4) == 3.4);