Apply clang-tidy's performance-unnecessary-value-param to LLVM.

With some minor manual fixes for using function_ref instead of
std::function. No functional change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291904 91177308-0d34-0410-b5e6-96231b3b80d8
34 files changed