[llvm] [CodeGen][MachinePipeliner] Limit register pressure when scheduling (PR #74807)

[Leandro Lupori via llvm-commits]

================
@@ -2044,6 +2457,16 @@ bool SwingSchedulerDAG::schedulePipeline(SMSchedule &Schedule) {
     // If a schedule is found, check if it is a valid schedule too.
     if (scheduleFound)
       scheduleFound = Schedule.isValidSchedule(this);
+
+    // If a schedule found and the option is enabled, check if the schedule
+    // might generate additional register spill/fill
----------------
luporl wrote:

```suggestion
    // If a schedule was found and the option is enabled, check if the schedule
    // might generate additional register spills/fills.
```

https://github.com/llvm/llvm-project/pull/74807