Ignore GCC's always inline warnings in MurmurHash.
Ignore GCC's always inline warnings in MurmurHash.

These were benign and treated as errors. The always inline attribute
may still have some value, so I left it in.

BUG=angle:773

Change-Id: I78c5f792485e8f8d890123ee861cfecf2a5649be
Reviewed-on: https://chromium-review.googlesource.com/232790
Tested-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Brandon Jones <303ddc8529a3012e7fb187d611f08537af0cc183@chromium.org>

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