Avoid warnings about unused parameters that tend to come up a lot when

Avoid warnings about unused parameters that tend to come up a lot when
building outside projects with a different compiler than that used to build
LLVM itself (eg switching between gcc and clang).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183650 91177308-0d34-0410-b5e6-96231b3b80d8