[MachineBlockPlacementStats] Added check for "-filter-print-funcs" option to the machine-block-placement-stats

[mingmingl]

Summary

The code change is similar to https://reviews.llvm.org/D114310; basically allow users to filter stats for a specific function.

[davidxl]

lgtm

[mingmingl]

No code change.

Update commit message with differential revision link.

[MaskRay]

If forgot to add Differential Revision, just leave it. Reverting a commit and recommitting just to add the information only adds more churn.
You can click "Add Action" -> "Close Revision" to manually close a revision.

[mingmingl]

In D128019#3591156, @MaskRay wrote:

If forgot to add Differential Revision, just leave it. Reverting a commit and recommitting just to add the information only adds more churn.
You can click "Add Action" -> "Close Revision" to manually close a revision.

Acknowledged. I have used the "close revision" button and add differential revision link in Github commit link in the past and will do it in the future.

llvm/lib/CodeGen/MachineBlockPlacement.cpp

 #include "llvm/CodeGen/MachineSizeOpts.h"
 #include "llvm/CodeGen/TailDuplicator.h"
 #include "llvm/CodeGen/TargetInstrInfo.h"
 #include "llvm/CodeGen/TargetLowering.h"
 #include "llvm/CodeGen/TargetPassConfig.h"
 #include "llvm/CodeGen/TargetSubtargetInfo.h"
 #include "llvm/IR/DebugLoc.h"
 #include "llvm/IR/Function.h"
+#include "llvm/IR/PrintPasses.h"
 #include "llvm/InitializePasses.h"
 #include "llvm/Pass.h"
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/BlockFrequency.h"
 #include "llvm/Support/BranchProbability.h"
 #include "llvm/Support/CodeGen.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Compiler.h"

 INITIALIZE_PASS_END(MachineBlockPlacementStats, "block-placement-stats",
                     "Basic Block Placement Stats", false, false)
 
 bool MachineBlockPlacementStats::runOnMachineFunction(MachineFunction &F) {
   // Check for single-block functions and skip them.
   if (std::next(F.begin()) == F.end())
     return false;
 
+  if (!isFunctionInPrintList(F.getName()))
+    return false;
+
   MBPI = &getAnalysis<MachineBranchProbabilityInfo>();
   MBFI = &getAnalysis<MachineBlockFrequencyInfo>();
 
   for (MachineBasicBlock &MBB : F) {
     BlockFrequency BlockFreq = MBFI->getBlockFreq(&MBB);
     Statistic &NumBranches =
         (MBB.succ_size() > 1) ? NumCondBranches : NumUncondBranches;
     Statistic &BranchTakenFreq =