[StackLifetime] add more detail log

[dongAxis1944]

Summary

When dumping results of StackLifetime, it will print the following log:

BB  [7, 8): begin {}, end {}, livein {}, liveout {}
BB  [1, 2): begin {}, end {}, livein {}, liveout {}
...

But it is not convenient to know what the basic block is.
So I add the basic block name to it.

TestPlan: check-llvm

llvm/lib/Analysis/StackLifetime.cpp

 }
 
 LLVM_DUMP_METHOD void StackLifetime::dumpBlockLiveness() const {
   dbgs() << "Block liveness:\n";
   for (auto IT : BlockLiveness) {
     const BasicBlock *BB = IT.getFirst();
     const BlockLifetimeInfo &BlockInfo = BlockLiveness.find(BB)->getSecond();
     auto BlockRange = BlockInstRange.find(BB)->getSecond();
-    dbgs() << "  BB [" << BlockRange.first << ", " << BlockRange.second
+    dbgs() << "  BB (" << BB->getName() << ") [" << BlockRange.first << ", " << BlockRange.second
            << "): begin " << BlockInfo.Begin << ", end " << BlockInfo.End
            << ", livein " << BlockInfo.LiveIn << ", liveout "
            << BlockInfo.LiveOut << "\n";
   }
 }
 
 LLVM_DUMP_METHOD void StackLifetime::dumpLiveRanges() const {
   dbgs() << "Alloca liveness:\n";