[BOLT][NFC] Print functions after attaching profile (-print-profile)

[Amir]

Summary

Add an extra point of dumping functions: immediately after attaching the profile information.
This dumping is enabled by newly introduced -print-profile and -print-all.

The reason is that in aggregate-only/perf2bolt mode BOLT may not reach the point of
printing the function after CFG is constructed (-print-cfg), while we may still want to inspect
the attached profile, especially for diff'ing purposes.

[rafauler]

LGTM

bolt/lib/Rewrite/RewriteInstance.cpp

static cl::opt<unsigned> MaxDataRelocations(
     "max-data-relocations",
     cl::desc("maximum number of data relocations to process"), cl::Hidden,
     cl::cat(BoltCategory));
 
 cl::opt<bool> PrintAll("print-all",
                        cl::desc("print functions after each stage"), cl::Hidden,
                        cl::cat(BoltCategory));
 
+cl::opt<bool> PrintProfile("print-profile",
+                           cl::desc("print functions after attaching profile"),
+                           cl::Hidden, cl::cat(BoltCategory));
+
 cl::opt<bool> PrintCFG("print-cfg",
                        cl::desc("print functions after CFG construction"),
                        cl::Hidden, cl::cat(BoltCategory));
 
 cl::opt<bool> PrintDisasm("print-disasm",
                           cl::desc("print function after disassembly"),
                           cl::Hidden, cl::cat(BoltCategory));
 
if (!ProfileReader)
     return;
 
   NamedRegionTimer T("processprofile", "process profile data", TimerGroupName,
                      TimerGroupDesc, opts::TimeRewrite);
 
   if (Error E = ProfileReader->readProfile(*BC.get()))
     report_error("cannot read profile", std::move(E));
 
+  if (opts::PrintProfile || opts::PrintAll) {
+    for (auto &BFI : BC->getBinaryFunctions()) {
+      BinaryFunction &Function = BFI.second;
+      if (Function.empty())
+        continue;
+
+      Function.print(outs(), "after attaching profile");
+    }
+  }
+
   if (!opts::SaveProfile.empty()) {
     YAMLProfileWriter PW(opts::SaveProfile);
     PW.writeProfile(*this);
   }
   if (opts::AggregateOnly &&
       opts::ProfileFormat == opts::ProfileFormatKind::PF_YAML) {
     YAMLProfileWriter PW(opts::OutputFilename);
     PW.writeProfile(*this);