[clang] Fix -Wunused-function in CGStmtOpenMP.cpp (NFC)

llvm-project/clang/lib/CodeGen/CGStmtOpenMP.cpp:7959:13:
error: unused function 'emitTargetTeamsLoopCodegenStatus' [-Werror,-Wunused-function]
static void emitTargetTeamsLoopCodegenStatus(CodeGenFunction &CGF,
            ^
1 error generated.