[analyzer] MallocChecker: Prevent Integer Set Library false positives

Summary:
Integer Set Library using retain-count based allocation which is not
modeled in MallocChecker.

Reviewed By: NoQ

Tags: #clang

Differential Revision: https://reviews.llvm.org/D64680

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@366391 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed