Only set output ranges when updating dbg info.

Summary: Save processing time by setting output ranges when needed.

(cherry picked from FBD3148791)

bolt/RewriteInstance.cpp

@@ -1397,6 +1397,7 @@ void RewriteInstance::emitFunctions() {
     }
   }
 
+  if (opts::UpdateDebugSections) {
     MCAsmLayout Layout(
         static_cast<MCObjectStreamer *>(Streamer.get())->getAssembler());
 
@@ -1416,6 +1417,7 @@ void RewriteInstance::emitFunctions() {
         BB.setOutputAddressRange(std::make_pair(BeginAddress, EndAddress));
       }
     }
+  }
 
   OLT.emitAndFinalize(ObjectsHandle);