[sanitizer] Use the correct macro to check glibc version.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@185324 91177308-0d34-0410-b5e6-96231b3b80d8
[ASan] Cache atos processes to make Darwin symbolication faster.

Patch by Jesse Ruderman<jruderman@gmail.com>



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@185325 91177308-0d34-0410-b5e6-96231b3b80d8