[esan] Fix workingset-memset test failure
[esan] Fix workingset-memset test failure

Fixes an esan workingset-memset test failure by switching to malloc to
avoid a shadow mapping issue with mmap in certain situations that will be
fully fixed separately.

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@270949 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