[asan] Fix OOB_char on arm 32bit

Summary:
This does not actually fixes the test.
AddressSanitizer::OOB_char behavior is inconsistent but it somehow usually
works. On arm it runs more iterations than expected. And adding a new test with AddressSanitizerInterface prefix, even empty, somehow breaks OOB_char test.
So I will rename my test to make the bot green and will continue to investigate the test.

Reviewers: krasin

Subscribers: aemerson, rengolin, kubabrecka, llvm-commits, samparker

Differential Revision: https://reviews.llvm.org/D23790

llvm-svn: 279501