[analyzer] Do not walk the types for call graph construction.

Similar to r156661. This should be beneficial performance wise and
hopefully, resolve a RecursiveASTVisitor crash that we are seeing in the
wild, but are incapable of reproducing.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158851 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed