[Fuzzer] Don't hardcode target architecture for Fuzzer tests

Don't hardcode the architecture for Fuzzer tests which breaks when
compiler-rt is being compiled for architectures other than x86_64.

Differential Revision: https://reviews.llvm.org/D48207

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer@334852 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed