Revert of Correctly compute line numbers in functions from the function constructor.

src/messages.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // -------------------------------------------------------------------
 
 var kMessages = {
   // Error
   cyclic_proto:                  ["Cyclic __proto__ value"],
   code_gen_from_strings:         ["%0"],
@@ skipping 392 matching lines @@
   return MakeGenericError($ReferenceError, type, [arg]);
 }
 
 /**
  * Find a line number given a specific source position.
  * @param {number} position The source position.
  * @return {number} 0 if input too small, -1 if input too large,
        else the line number.
  */
 function ScriptLineFromPosition(position) {
+  var lower = 0;
+  var upper = this.lineCount() - 1;
   var line_ends = this.line_ends;
-  var upper = line_ends.length - 1;
-  if (upper < 0) return -1;
 
   // We'll never find invalid positions so bail right away.
-  if (position > line_ends[upper]) return -1;
-  if (position <= line_ends[0]) return 0;
+  if (position > line_ends[upper]) {
+    return -1;
+  }
 
-  var lower = 1;
-  // Binary search.
-  while (true) {
-    var mid = (upper + lower) >> 1;
-    if (position <= line_ends[mid - 1]) {
-      upper = mid - 1;
-    } else if (position > line_ends[mid]){
-      lower = mid + 1;
+  // This means we don't have to safe-guard indexing line_ends[i - 1].
+  if (position <= line_ends[0]) {
+    return 0;
+  }
+
+  // Binary search to find line # from position range.
+  while (upper >= 1) {
+    var i = (lower + upper) >> 1;
+
+    if (position > line_ends[i]) {
+      lower = i + 1;
+    } else if (position <= line_ends[i - 1]) {
+      upper = i - 1;
     } else {
-      return mid;
+      return i;
     }
   }
+
+  return -1;
 }
 
 /**
  * Get information on a specific source position.
  * @param {number} position The source position
  * @param {boolean} include_resource_offset Set to true to have the resource
  *     offset added to the location
  * @return {SourceLocation}
  *     If line is negative or not in the source null is returned.
  */
@@ skipping 826 matching lines @@
 function SetUpStackOverflowBoilerplate() {
   var boilerplate = MakeRangeError('stack_overflow', []);
 
   %DefineAccessorPropertyUnchecked(
       boilerplate, 'stack', StackTraceGetter, StackTraceSetter, DONT_ENUM);
 
   return boilerplate;
 }
 
 var kStackOverflowBoilerplate = SetUpStackOverflowBoilerplate();