Don't attempt to merge a deserialized declaration with existing
declarations in the AST unless modules are enabled. This case doesn't
come up with precompiled headers, and it isn't cheap.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@147451 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed