[Debugify] Add a quiet mode to suppress warnings
Suppressing warning output and module dumps significantly speeds up
fuzzing with `opt -debugify-each`.
llvm-svn: 334117
diff --git a/llvm/test/DebugInfo/debugify-each.ll b/llvm/test/DebugInfo/debugify-each.ll
index 8d5eb46..e290b94 100644
--- a/llvm/test/DebugInfo/debugify-each.ll
+++ b/llvm/test/DebugInfo/debugify-each.ll
@@ -13,6 +13,9 @@
; Verify that debugify each can be safely used with piping
; RUN: opt -debugify-each -O1 < %s | opt -O2 -o /dev/null
+; Check that the quiet mode emits no messages.
+; RUN: opt -disable-output -debugify-quiet -debugify-each -O1 < %s 2>&1 | count 0
+
; Check that stripped textual IR compares equal before and after applying
; debugify.
; RUN: opt -O1 < %s -S -o - | \
