opt(1) on Linux
The text 4979768e644a, as Debian 9 (Stretch) shipped it.
LLVM optimizer
Flags it lists
-
-S -
-debug -
-disable-inlining -
-disable-opt -
-f -
-help -
-load -
-o -
-p -
-stats -
-strip-debug -
-time-passes -
-verify-each