Add ignore file for TSan build

- Added ignores.txt file. When doing a tsan build,
  tsan_blacklist gyp flag should point to the file.

Change-Id: Ia69f89f1906f0b386e081a7df5a7c867e411f8fd

packager/tools/memory/tsan_v2/ignores.txt

@@ -0,0 +1,6 @@
+# The rules in this file are only applied at compile time. If you can modify the
+# source in question, consider function attributes to disable instrumentation.
+#
+# Please think twice before you add or remove these rules.
+# Data races should typically go to suppressions.txt.
+