[clang-move] Fix an incorrect range for the functions whose returned value is a macro

Summary:
Fix an incorrect range for the functions whose returned value is a macro
(e.g. `bool`). This incorrect range can lead to modifications of an unexpected
file where the macro is in.

We should use expansion location instead of spelling location.

Reviewers: ioeric

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D26609

llvm-svn: 286833