[Sanitizer] Always prefer cached contents of /proc/self/exe if it's available
[Sanitizer] Always prefer cached contents of /proc/self/exe if it's available

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@209773 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