Add -pass-pipeline-crash-reproducer to npcomp-opt alias.

tools/bash_helpers.sh

@@ -12,7 +12,10 @@ npcomp-opt() {
   # Usage:
   # $ npcomp-opt <regular npcomp-opt options>
   ninja -C "$build_dir" npcomp-opt 1>&2 || return 1
-  "${build_dir}/bin/npcomp-opt" "$@"
+  # Also produce a reproducer by default.
+  "${build_dir}/bin/npcomp-opt" \
+    "-pass-pipeline-crash-reproducer=/tmp/reproducer.mlir" \
+    "$@"
 }
 
 npcomp-run-mlir() {
@@ -28,19 +31,6 @@ npcomp-run-mlir() {
     -shared-libs="${build_dir}/lib/libNPCOMPCompilerRuntimeShlib.so" "$@"
 }
 
-mnist-playground() {
-  # Helper for building and invoking mnist-playground
-  #
-  # This also automatically builds and adds the npcomp runtime shared
-  # library.
-  #
-  # Usage:
-  # $ mnist-playground <regular mnist-playground options>
-  ninja -C "$build_dir" mnist-playground NPCOMPCompilerRuntimeShlib 1>&2 || return 1
-  "$build_dir/bin/mnist-playground" \
-    -shared-libs="${build_dir}/lib/libNPCOMPCompilerRuntimeShlib.so" "$@"
-}
-
 # Go to the root of your npcomp checkout.
 alias npd="cd $td"
 # Handy so that `npctest -v` runs lit with -v and thus prints out errors,