[clang-tidy] Ignore a case where the fix of make_unique check introduces side effect.

Summary:
Previously, ptr.reset(new char[5]) will be replaced with `p =
make_unique<char[]>(5)`, the fix has side effect -- doing
default initialization, it may cause performace regression (we are
bitten by this rececntly)

The check should be conservative for these cases.

Reviewers: alexfh

Subscribers: xazax.hun, cfe-commits

Differential Revision: https://reviews.llvm.org/D53377

llvm-svn: 344733