[analyzer] Rename addExtraInvalidatedRegions to get...Regions

Per Anna's comment that "add..." sounds like a method that modifies
the receiver, rather than its argument.

No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160460 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed