Revert "[MachineScheduler] Convert some of the debug prints into using LDBG. NFC (llvm#161997)"

This reverts commit a741479.

This breaks builds:
 3355 |            << SchedModel->getResourceName(CurrZone.getZoneCritResIdx()) << "\n";
      |               ~~~~~~~~~~  ^
/home/buildbot/workspace/bolt-aarch64-ubuntu-clang/llvm-project/llvm/lib/CodeGen/MachineScheduler.cpp:3358:51: error: no member named 'getResourceName' in 'llvm::TargetSchedModel'
 3358 |     LDBG() << "  RemainingLimit: " << SchedModel->getResourceName(OtherCritIdx)
      |                                       ~~~~~~~~~~  ^
2 errors generated.

E.g. https://lab.llvm.org/buildbot/#/builders/128/builds/7522

Author: tbaederr

llvm/lib/CodeGen/MachineScheduler.cpp

@@ -56,7 +56,6 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/Debug.h"
-#include "llvm/Support/DebugLog.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/GraphWriter.h"
 #include "llvm/Support/raw_ostream.h"
@@ -3350,16 +3349,14 @@ void GenericSchedulerBase::setPolicy(CandPolicy &Policy, bool IsPostRA,
   if (CurrZone.getZoneCritResIdx() == OtherCritIdx)
     return;
 
-  if (CurrZone.isResourceLimited()) {
-    LDBG() << "  " << CurrZone.Available.getName() << " ResourceLimited: "
+  LLVM_DEBUG(if (CurrZone.isResourceLimited()) {
+    dbgs() << "  " << CurrZone.Available.getName() << " ResourceLimited: "
            << SchedModel->getResourceName(CurrZone.getZoneCritResIdx()) << "\n";
-  }
-  if (OtherResLimited) {
-    LDBG() << "  RemainingLimit: " << SchedModel->getResourceName(OtherCritIdx)
-           << "\n";
-  }
-  if (!CurrZone.isResourceLimited() && !OtherResLimited)
-    LDBG() << "  Latency limited both directions.\n";
+  } if (OtherResLimited) dbgs()
+                 << "  RemainingLimit: "
+                 << SchedModel->getResourceName(OtherCritIdx) << "\n";
+             if (!CurrZone.isResourceLimited() && !OtherResLimited) dbgs()
+             << "  Latency limited both directions.\n");
 
   if (CurrZone.isResourceLimited() && !Policy.ReduceResIdx)
     Policy.ReduceResIdx = CurrZone.getZoneCritResIdx();