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Revert "Speedup to_string and to_wstring for integers using stack buffer and…

Authored by vlad.tsyrklevich on Jun 6 2019, 12:51 AM.

Description

Revert "Speedup to_string and to_wstring for integers using stack buffer and SSO."

This reverts commit 7ce7110e6d964778141c0866488e154b1ce73d69, it was
causing sanitizer bot failures due to changing behavior of
std::to_string(). See https://reviews.llvm.org/D59178#1532023

llvm-svn: 362680