[sanitizers] rewriting test assuming assert() changes coverage.
[sanitizers] rewriting test assuming assert() changes coverage.

Summary:
On windows platform assert() call creates two distinct CFG edges
which are coverage-instrumented. Simply calling assert would
change coverage numbers on the platform.

Subscribers: kubabrecka

Differential Revision: http://reviews.llvm.org/D19514

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@267610 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt