Make compilers agree on source position of thrown errors.

test/mjsunit/debug-backtrace.js

Index: test/mjsunit/debug-backtrace.js
diff --git a/test/mjsunit/debug-backtrace.js b/test/mjsunit/debug-backtrace.js
index 3647913ac1fbed59ff54363b895c4ab32f7caf05..b4fb2c8535a6dbde73d95bdd61af7ad71c964fb1 100644
--- a/test/mjsunit/debug-backtrace.js
+++ b/test/mjsunit/debug-backtrace.js
@@ -195,7 +195,7 @@ function listener(event, exec_state, event_data, data) {
       assertEquals("m", response.lookup(frame.func.ref).inferredName);
       assertFalse(frame.constructCall);
       assertEquals(35, frame.line);
-      assertEquals(6, frame.column);
+      assertEquals(2, frame.column);
       assertEquals(0, frame.arguments.length);
 
       json = '{"seq":0,"type":"request","command":"frame","arguments":{"number":3}}'