llvm-reduce: Don't print verifier failed machine functions (llvm#109673)

This produces far too much terminal output, particularly for the
instruction reduction. Since it doesn't consider the liveness of of
the instructions it's deleting, it produces quite a lot of verifier
errors.

Author: arsenm

llvm/include/llvm/CodeGen/MachineFunction.h

@@ -897,13 +897,14 @@ class LLVM_ABI MachineFunction {
   /// for debugger use.
   /// \returns true if no problems were found.
   bool verify(Pass *p = nullptr, const char *Banner = nullptr,
-              bool AbortOnError = true) const;
+              raw_ostream *OS = nullptr, bool AbortOnError = true) const;
 
   /// Run the current MachineFunction through the machine code verifier, useful
   /// for debugger use.
   /// \returns true if no problems were found.
   bool verify(LiveIntervals *LiveInts, SlotIndexes *Indexes,
-              const char *Banner = nullptr, bool AbortOnError = true) const;
+              const char *Banner = nullptr, raw_ostream *OS = nullptr,
+              bool AbortOnError = true) const;
 
   // Provide accessors for the MachineBasicBlock list...
   using iterator = BasicBlockListType::iterator;

llvm/lib/CodeGen/MIRParser/MIRParser.cpp

@@ -634,7 +634,7 @@ MIRParserImpl::initializeMachineFunction(const yaml::MachineFunction &YamlMF,
 
   MF.getSubtarget().mirFileLoaded(MF);
 
-  MF.verify();
+  MF.verify(nullptr, nullptr, &errs());
   return false;
 }
 

llvm/lib/CodeGen/MachineBlockPlacement.cpp

@@ -3698,7 +3698,7 @@ void MachineBlockPlacement::assignBlockOrder(
 
 #ifndef NDEBUG
   // Make sure we correctly constructed all branches.
-  F->verify(this, "After optimized block reordering");
+  F->verify(this, "After optimized block reordering", &errs());
 #endif
 }
 

llvm/lib/CodeGen/MachineScheduler.cpp

@@ -453,7 +453,7 @@ bool MachineScheduler::runOnMachineFunction(MachineFunction &mf) {
 
   if (VerifyScheduling) {
     LLVM_DEBUG(LIS->dump());
-    MF->verify(this, "Before machine scheduling.");
+    MF->verify(this, "Before machine scheduling.", &errs());
   }
   RegClassInfo->runOnMachineFunction(*MF);
 
@@ -472,7 +472,7 @@ bool MachineScheduler::runOnMachineFunction(MachineFunction &mf) {
 
   LLVM_DEBUG(LIS->dump());
   if (VerifyScheduling)
-    MF->verify(this, "After machine scheduling.");
+    MF->verify(this, "After machine scheduling.", &errs());
   return true;
 }
 
@@ -496,7 +496,7 @@ bool PostMachineScheduler::runOnMachineFunction(MachineFunction &mf) {
   AA = &getAnalysis<AAResultsWrapperPass>().getAAResults();
 
   if (VerifyScheduling)
-    MF->verify(this, "Before post machine scheduling.");
+    MF->verify(this, "Before post machine scheduling.", &errs());
 
   // Instantiate the selected scheduler for this target, function, and
   // optimization level.
@@ -512,7 +512,7 @@ bool PostMachineScheduler::runOnMachineFunction(MachineFunction &mf) {
   scheduleRegions(*Scheduler, true);
 
   if (VerifyScheduling)
-    MF->verify(this, "After post machine scheduling.");
+    MF->verify(this, "After post machine scheduling.", &errs());
   return true;
 }