[debug-wrapper] clearAllBreakPoints and several scripts functions

test/debugger/debug/function-source.js

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-// Flags: --expose-debug-as debug
-// Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 
 // Check that the script source for all functions in a script is the same.
 function f() {
   function h() {
     assertEquals(Debug.scriptSource(f), Debug.scriptSource(h));
   }
   h();
 }
 
 function g() {
   function h() {
     assertEquals(Debug.scriptSource(f), Debug.scriptSource(h));
   }
   h();
 }
 
 assertEquals(Debug.scriptSource(f), Debug.scriptSource(g));
 f();
 g();