Stack traces exposed to Javascript should omit extensions.

test/mjsunit/stack-traces-overflow.js

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+// Flags: --stack-size=100
+
 function rec1(a) { rec1(a+1); }
 function rec2(a) { rec3(a+1); }
 function rec3(a) { rec2(a+1); }
 
 // Test stack trace getter and setter.
 try {
   rec1(0);
 } catch (e) {
   assertTrue(e.stack.indexOf("rec1") > 0);
   e.stack = "123";
@@ skipping 90 matching lines @@
   assertEquals(undefined, e.stack);
 }
 
 Error.stackTraceLimit = 3;
 Error = "";  // Overwrite Error in the global object.
 try {
   rec1(0);
 } catch (e) {
   assertEquals(4, e.stack.split('\n').length);
 }