[sanitizer] Add suffix to report file name

For those using a GUI, it can be very helpful to have a
particular suffix appended to the report file name, so
it can be opened with a double-click.

(see also: https://github.com/google/sanitizers/issues/951)

Reviewed By: vitalybuka

Differential Revision: https://reviews.llvm.org/D46546

GitOrigin-RevId: dd5c2b8de92d109c78b6b0961a496d328aa25854
3 files changed