Upgrade V8 to 5.1.281.57  DO NOT MERGE

FPIIM-449

Change-Id: Id981b686b4d587ac31697662eb98bb34be42ad90
(cherry picked from commit 3b9bc31999c9787eb726ecdbfd5796bfdec32a18)
diff --git a/test/mjsunit/strict-mode.js b/test/mjsunit/strict-mode.js
index 63dc9d0..f7f95da 100644
--- a/test/mjsunit/strict-mode.js
+++ b/test/mjsunit/strict-mode.js
@@ -1149,7 +1149,7 @@
 
   function strict() {
     "use strict";
-    // Returning result via local variable to avoid tail call optimization.
+    // Returning result via local variable to avoid tail call elimination.
     var res = return_my_caller();
     return res;
   }
@@ -1165,7 +1165,7 @@
 (function TestNonStrictFunctionCallerPill() {
   function strict(n) {
     "use strict";
-    // Returning result via local variable to avoid tail call optimization.
+    // Returning result via local variable to avoid tail call elimination.
     var res = non_strict(n);
     return res;
   }
@@ -1195,7 +1195,7 @@
 (function TestNonStrictFunctionCallerDescriptorPill() {
   function strict(n) {
     "use strict";
-    // Returning result via local variable to avoid tail call optimization.
+    // Returning result via local variable to avoid tail call elimination.
     var res = non_strict(n);
     return res;
   }