[compiler-rt][asan|win] Fix flaky unittest due to large allocations
[compiler-rt][asan|win] Fix flaky unittest due to large allocations

Summary:
Coverage is using large arrays which requires large allocations.
These allocations are flaky and often failing on win64.

We are using the 32-bits size until this gets a better fix.

Reviewers: rnk

Reviewed By: rnk

Subscribers: llvm-commits, kubamracek, chrisha, dberris

Differential Revision: https://reviews.llvm.org/D29945

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@295086 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