This not only potentially improves performance, but also avoids weird
linker errors, like the one below, where I used Smi::kMinValue in a
DCHECK_EQ.

> [421/649] LINK ./mksnapshot
> FAILED: mksnapshot
> src/base/logging.h|178| error: undefined reference to
  'v8::internal::Smi::kMinValue'

R=bmeurer@chromium.org, ishell@chromium.org

Review-Url: https://codereview.chromium.org/2524093002
Cr-Commit-Position: refs/heads/master@{#41273}