[BOLT][YAML] Only read first profile per function

[Amir]

Summary

Work around the issue of multiple profiles per function.
Can happen with a stale profile which has separate profiles
that in a new binary got merged and became aliases.

bolt/lib/Profile/YAMLProfileReader.cpp

if (!opts::IgnoreHash)
       Function.computeHash(YamlBP.Header.IsDFSOrder);
 
     for (StringRef FunctionName : Function.getNames()) {
       auto PI = ProfileNameToProfile.find(FunctionName);
       if (PI == ProfileNameToProfile.end())
         continue;
 
       yaml::bolt::BinaryFunctionProfile &YamlBF = *PI->getValue();
-      if (profileMatches(YamlBF, Function))
+      if (profileMatches(YamlBF, Function)) {
         matchProfileToFunction(YamlBF, Function);
+        break;
+      }
     }
   }
 
   for (auto &BFI : BC.getBinaryFunctions()) {
     BinaryFunction &Function = BFI.second;
 
     if (ProfiledFunctions.count(&Function))
       continue;