[llvm] [MacroFusion] Support multiple predicators (PR #72219)

[Joe Nash via llvm-commits]

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@@ -48,15 +48,15 @@ bool fuseInstructionPair(ScheduleDAGInstrs &DAG, SUnit &FirstSU,
 
 /// Create a DAG scheduling mutation to pair instructions back to back
 /// for instructions that benefit according to the target-specific
-/// shouldScheduleAdjacent predicate function.
+/// predicate functions.
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Sisyph wrote:

Please document that shouldScheduleAdjacent will be true if any of the provided predicates are true

https://github.com/llvm/llvm-project/pull/72219