Disable the aggressive memcmp checks under ASan.

scripts/slave/runtest.py

Index: scripts/slave/runtest.py
===================================================================
--- scripts/slave/runtest.py	(revision 185890)
+++ scripts/slave/runtest.py	(working copy)
@@ -1032,6 +1032,8 @@
   if options.factory_properties.get('asan', False):
     # Set the path to llvm-symbolizer to be used by asan_symbolize.py
     os.environ['LLVM_SYMBOLIZER_PATH'] = symbolizer_path
+    # Avoid aggressive memcmp checks until http://crbug.com/178677 is fixed.
+    os.environ['ASAN_OPTIONS'] = 'strict_memcmp=0'
   # Set the number of shards environement variables.
   if options.total_shards and options.shard_index:
     os.environ['GTEST_TOTAL_SHARDS'] = str(options.total_shards)