propagate __config_site includes when building benchmarks

llvm-svn: 346933
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 0997403a22ff9d222eb09ff3cd6ca2d463c70acf
1 file changed