Fix the stack script issue when symbolizing tombstones.

tools/mb/mb.py

Index: tools/mb/mb.py
diff --git a/tools/mb/mb.py b/tools/mb/mb.py
index 7335448bd5a15ddcc913a338ae361637743284e6..09011609c5e1e00ccda3fa7c535bec303988a64f 100755
--- a/tools/mb/mb.py
+++ b/tools/mb/mb.py
@@ -886,6 +886,14 @@ class MetaBuildWrapper(object):
       command, extra_files = self.GetIsolateCommand(target, vals)
 
       runtime_deps = self.ReadFile(runtime_deps_path).splitlines()
+      unstripped_libs = []
+      for f in runtime_deps:
+        if f.endswith('.so'):
+          if os.path.isfile(self.PathJoin(self.ToAbsPath(build_dir),
+                                          'lib.unstripped',
+                                          os.path.basename(f))):
+            unstripped_libs.append('lib.unstripped/%s' % os.path.basename(f))
+      runtime_deps.extend(unstripped_libs)
 
       self.WriteIsolateFiles(build_dir, command, target, runtime_deps,
                              extra_files)