[BOLT][NFC] Print block instructions in dumpGraph as part of node label

[Amir]

Summary

Reuse the option -dot-tooltip-code to put block instructions into the label.
This way, the instructions are displayed by default when used with dot viewer.

When the .dot file is used with dot2html, instructions are hidden by default,
and are shown by clicking on a node.

[Amir]

bolt/lib/Core/BinaryFunction.cpp

3010

strict is a property that a graph can't have two edges between two nodes.
BOLT has a pass to remove such edges but we still want to display graphs before this pass properly.

[rafauler]

LGTM

[Amir]

Rebase

bolt/lib/Core/BinaryFunction.cpp

for (unsigned I = 0; I < Str.size(); ++I) {
     }
   }
   return Result;
 }
 
 } // namespace
 
 void BinaryFunction::dumpGraph(raw_ostream &OS) const {
-  OS << "strict digraph \"" << getPrintName() << "\" {\n";
+  OS << "digraph \"" << getPrintName() << "\" {\n";
+  OS << R"(node [fontname="courier"])" << '\n';
   uint64_t Offset = Address;
   for (BinaryBasicBlock *BB : BasicBlocks) {
     auto LayoutPos =
         std::find(BasicBlocksLayout.begin(), BasicBlocksLayout.end(), BB);
     unsigned Layout = LayoutPos - BasicBlocksLayout.begin();
     const char *ColdStr = BB->isCold() ? " (cold)" : "";
-    OS << format("\"%s\" [label=\"%s%s\\n(C:%lu,O:%lu,I:%u,L:%u:CFI:%u)\"]\n",
-                 BB->getName().data(), BB->getName().data(), ColdStr,
-                 (BB->ExecutionCount != BinaryBasicBlock::COUNT_NO_PROFILE
-                      ? BB->ExecutionCount
-                      : 0),
-                 BB->getOffset(), getIndex(BB), Layout, BB->getCFIState());
     OS << format("\"%s\" [shape=box]\n", BB->getName().data());
+    OS << format("\"%s\" [label=\"%s%s\\n(C:%lu,O:%lu,I:%u,L:%u,CFI:%u)\\n",
+                 BB->getName().data(), BB->getName().data(), ColdStr,
+                 BB->getKnownExecutionCount(), BB->getOffset(), getIndex(BB),
+                 Layout, BB->getCFIState());
+
     if (opts::DotToolTipCode) {
       std::string Str;
       raw_string_ostream CS(Str);
-      Offset = BC.printInstructions(CS, BB->begin(), BB->end(), Offset, this);
-      const std::string Code = formatEscapes(CS.str());
-      OS << format("\"%s\" [tooltip=\"%s\"]\n", BB->getName().data(),
-                   Code.c_str());
+      Offset = BC.printInstructions(CS, BB->begin(), BB->end(), Offset, this,
+                                    /* PrintMCInst = */ false,
+                                    /* PrintMemData = */ false,
+                                    /* PrintRelocations = */ false,
+                                    /* Endl = */ R"(\\l)");
+      OS << formatEscapes(CS.str()) << '\n';
     }
+    OS << "\"]\n";
 
     // analyzeBranch is just used to get the names of the branch
     // opcodes.
     const MCSymbol *TBB = nullptr;
     const MCSymbol *FBB = nullptr;
     MCInst *CondBranch = nullptr;
     MCInst *UncondBranch = nullptr;
     const bool Success = BB->analyzeBranch(TBB, FBB, CondBranch, UncondBranch);