Revert "In PrepareForBreakPoints, also purge shared function info not referenced by functions."

test/mjsunit/regress/regress-crbug-424142.js

Index: test/mjsunit/regress/regress-crbug-424142.js
diff --git a/test/mjsunit/regress/regress-crbug-424142.js b/test/mjsunit/regress/regress-crbug-424142.js
deleted file mode 100644
index 0a370d414269062ff9dabae4e09e4e7a2e77ea13..0000000000000000000000000000000000000000
--- a/test/mjsunit/regress/regress-crbug-424142.js
+++ /dev/null
@@ -1,36 +0,0 @@
-// Copyright 2014 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.
-
-// Flags: --expose-debug-as debug
-
-(function outer() {
-  var C = (function C_() {
-    var y = 1;
-    function CC() {
-      this.x = 0;
-    }
-    CC.prototype.f = function CCf() {
-      this.x += y;
-      return this.x;
-    };
-    return CC;
-  })();
-
-  var c = new C(0);
-})
-
-function sentinel() {}
-
-Debug = debug.Debug;
-
-var script = Debug.findScript(sentinel);
-var line = 14;
-var line_start = Debug.findScriptSourcePosition(script, line, 0);
-var line_end = Debug.findScriptSourcePosition(script, line + 1, 0) - 1;
-var actual = Debug.setBreakPointByScriptIdAndPosition(
-                 script.id, line_start).actual_position;
-// Make sure the actual break position is within the line where we set
-// the break point.
-assertTrue(line_start <= actual);
-assertTrue(actual <= line_end);