Fix build failure with GCC on identifier reusing.
Fix build failure with GCC on identifier reusing.

- GCC is different from clang and other compilers on that.
  https://godbolt.org/z/CeQE1V

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@373633 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm