Revert "SmallIntFormatter: simplify implementation."

This reverts commit 2e0c90b4c98f3fa7d5b7a71cf4058afa589cb6e0.

It is to make gcc with '-std=gnu+11' happy. v8 trybots with gcc(C++ 11)
failed to compile with this CL.

Bug: 802890
Test: None
Change-Id: I4c77d07281ebaefec9bb03fd4fba92e436009bd2
TBR=digit@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/869110
Reviewed-by: Jungshik Shin <jshin@chromium.org>
3 files changed