[analyzer] Try to devirtualize even if the static callee has no definition.

This mostly affects pure virtual methods, but would also affect parent
methods defined inline in the header when analyzing the child's source file.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@161709 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed