A couple of other "stack overflow" vs. "has_pending_exception()" issues fixed.

test/mjsunit/regress/regress-crbug-450960.js

Index: test/mjsunit/regress/regress-crbug-450960.js
diff --git a/test/mjsunit/regress/regress-crbug-450960.js b/test/mjsunit/regress/regress-crbug-450960.js
index f745522dbe7d88ce2834e8d22f3ecbb93e6e9f91..28db6dff8b8cb137b7cd1e397a37ab1047c32f4c 100644
--- a/test/mjsunit/regress/regress-crbug-450960.js
+++ b/test/mjsunit/regress/regress-crbug-450960.js
@@ -2,15 +2,19 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --stack-size=70
+// Flags: --stack-size=100
 
 "a".replace(/a/g, "");
 
+var count = 0;
 function test() {
    try {
      test();
    } catch(e) {
-     "b".replace(/(b)/g, new []);
+     if (count < 50) {
+       count++;
+       "b".replace(/(b)/g, new []);
+     }
    }
 }