[C++11] Replace some comparisons with 'nullptr' with simple boolean checks to reduce verbosity.

llvm-svn: 205829
diff --git a/llvm/lib/Support/Timer.cpp b/llvm/lib/Support/Timer.cpp
index c2ce90c..ea75d45 100644
--- a/llvm/lib/Support/Timer.cpp
+++ b/llvm/lib/Support/Timer.cpp
@@ -264,7 +264,7 @@
 TimerGroup::~TimerGroup() {
   // If the timer group is destroyed before the timers it owns, accumulate and
   // print the timing data.
-  while (FirstTimer != nullptr)
+  while (FirstTimer)
     removeTimer(*FirstTimer);
   
   // Remove the group from the TimerGroupList.
@@ -291,7 +291,7 @@
   
   // Print the report when all timers in this group are destroyed if some of
   // them were started.
-  if (FirstTimer != nullptr || TimersToPrint.empty())
+  if (FirstTimer || TimersToPrint.empty())
     return;
   
   raw_ostream *OutStream = CreateInfoOutputFile();