[clang] [flang] [libcxx] [llvm] [llvm-reduce]: print short form, actionable names in the log (PR #132813)

[Matt Arsenault via llvm-commits]

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@@ -17,8 +17,8 @@
 #include "Delta.h"
 
 namespace llvm {
-void reduceAliasesDeltaPass(TestRunner &Test);
-void reduceIFuncsDeltaPass(TestRunner &Test);
+void reduceAliasesDeltaPass(TestRunner &Test, StringRef PassMessage);
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arsenm wrote:

Something is backwards here. The delta pass implementations shouldn't need to be told what the message is. Instead, can we have these reduce*DeltaPasses return the function_ref to the implementation function, and have the driver in DeltaManager handle the printing of the message from the DeltaPass information?

https://github.com/llvm/llvm-project/pull/132813