Convert failing assertion in ll_prof.py to a warning

tools/ll_prof.py

 #!/usr/bin/env python
 #
-# Copyright 2010 the V8 project authors. All rights reserved.
+# Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
 #       with the distribution.
@@ skipping 726 matching lines @@
           if section in code_sections:
             if dynamic or section in reloc_sections:
               start_address += mmap_info.addr
             size = int(match.group(4), 16)
             name = match.group(5)
             origin = mmap_info.filename
             code_map.Add(Code(name, start_address, start_address + size,
                               origin, origin_offset))
     finally:
       pipe.close()
-    assert process.wait() == 0, "Failed to objdump %s" % mmap_info.filename
+    if process.wait() != 0:
+      print "Warning: Failed to objdump %s" % mmap_info.filename
 
   def Tick(self, pc):
     for i, mmap_info in enumerate(self.infos):
       if mmap_info.addr <= pc < (mmap_info.addr + mmap_info.len):
         mmap_info.ticks += 1
         self.infos[0], self.infos[i] = mmap_info, self.infos[0]
         return True
     return False
 
   def _UniqueMmapName(self, mmap_info):
@@ skipping 177 matching lines @@
       print "%10d total ticks" % ticks
       print "%10d ticks not in symbols" % missed_ticks
       print "%10d unaccounted ticks" % really_missed_ticks
       print "%10d total symbols" % len([c for c in code_map.AllCode()])
       print "%10d used symbols" % len([c for c in code_map.UsedCode()])
       print "%9.2fs library processing time" % mmap_time
       print "%9.2fs tick processing time" % sample_time
 
   log_reader.Dispose()
   trace_reader.Dispose()