Small fixes for detect_invalid_pointer_pairs.

Summary:
One test-case uses a wrong operation (should be subtraction).
Second test-case should declare a global variables before a tested one
in order to guarantee we will find a red-zone.

Reviewers: kcc, jakubjelinek, alekseyshl

Reviewed By: alekseyshl

Subscribers: kubamracek

Differential Revision: https://reviews.llvm.org/D41481

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@323162 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed