Upgrade to 3.29

Update V8 to 3.29.88.17 and update makefiles to support building on
all the relevant platforms.

Bug: 17370214

Change-Id: Ia3407c157fd8d72a93e23d8318ccaf6ecf77fa4e
diff --git a/test/mjsunit/regress/regress-490.js b/test/mjsunit/regress/regress-490.js
index 8dd8959..6ce89db 100644
--- a/test/mjsunit/regress/regress-490.js
+++ b/test/mjsunit/regress/regress-490.js
@@ -42,6 +42,9 @@
   var  b = '';
   for (var j = 0; j < 10; j++) {
     b += '$1';
+
+    // TODO(machenbach): Do we need all these replacements? Wouldn't corner
+    // cases like smallest and biggest suffice?
     a.replace(/^(.*)/, b);
   }
   a += a;