Suppress a warning from MSVC in 32-bit mode.
Suppress a warning from MSVC in 32-bit mode.

Fixes #114.

Change-Id: I371186fab00951ea52dd84878e21bb2e9142a756
Reviewed-on: https://code-review.googlesource.com/7592
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

google/re2,google/re2,google/re2,google/re2,google/re2