Fix 'Filter' function shadowing its own template parameter

Recent Clang versions will error about this, see
https://github.com/llvm/llvm-project/pull/78274

Bug: chromium:1519481
Change-Id: I6482153027a519d5765b9249a262cded3dcae09e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/third_party/libunwindstack/+/5217531
Reviewed-by: Mike Wittman <wittman@chromium.org>
3 files changed