[msan] Make chained_origin_limits test faster.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@217361 91177308-0d34-0410-b5e6-96231b3b80d8
[msan] Fix wrong array index in io_submit interceptor.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@217362 91177308-0d34-0410-b5e6-96231b3b80d8