[asan] Don't overalign global metadata.

Other than on COFF with incremental linking, global metadata should
not need any extra alignment.

Differential Revision: https://reviews.llvm.org/D28628

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291859 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed