Merge third_party/smhasher/src from https://chromium.googlesource.com/external/smhasher.git at 8adb1336422e3ad4d78ba54fb56692f2ed07124c

This commit was generated by merge_from_chromium.py.

Change-Id: I48bddcadccb4817edd8a80498e7f4d7ead9efeae