perf clang: Fix build with Clang 9

LLVM D59377 (included in Clang 9) refactored Clang VFS construction a
bit, which broke perf clang build.  Let's fix it.

Signed-off-by: Maciej S. Szmigiero <[email protected]>
Reviewed-by: Dennis Schridde <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: [email protected]
Cc: Denis Pronin <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Naohiro Aota <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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