[PM] Enable GlobalsAA in the new PM's pipeline by default.

All the invalidation issues and bugs in this seem to be fixed, it has
survived a full build of the test suite plus SPEC with asserts and ASan
enabled on the Clang binary used.

Differential Revision: https://reviews.llvm.org/D29815

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294887 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed