Timer: Remove group-less NamedRegionTimer constructor.

The NamedRegionTimer initializer without a group name puts the Timer
into the "Misc" group and is (nearly) unused. Remove it.

The only user of this constructor appears to be the HexagonGenInsert pass,
which creates a counter without group to count the complete execution
time of that pass, however since every pass gets a counter by the
PassManager anyway this should be unnecessary. Also removed the
pointless TimerGroup there.

Differential Revision: https://reviews.llvm.org/D25582

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286524 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/Timer.h

@@ -152,8 +152,6 @@ public:
 /// statement.  All timers with the same name are merged.  This is primarily
 /// used for debugging and for hunting performance problems.
 struct NamedRegionTimer : public TimeRegion {
-  explicit NamedRegionTimer(StringRef Name,
-                            bool Enabled = true);
   explicit NamedRegionTimer(StringRef Name, StringRef GroupName,
                             bool Enabled = true);
 };

lib/Support/Timer.cpp

@@ -210,22 +210,8 @@ public:
 
 }
 
-static ManagedStatic<Name2TimerMap> NamedTimers;
 static ManagedStatic<Name2PairMap> NamedGroupedTimers;
 
-static Timer &getNamedRegionTimer(StringRef Name) {
-  sys::SmartScopedLock<true> L(*TimerLock);
-
-  Timer &T = (*NamedTimers)[Name];
-  if (!T.isInitialized())
-    T.init(Name);
-  return T;
-}
-
-NamedRegionTimer::NamedRegionTimer(StringRef Name,
-                                   bool Enabled)
-  : TimeRegion(!Enabled ? nullptr : &getNamedRegionTimer(Name)) {}
-
 NamedRegionTimer::NamedRegionTimer(StringRef Name, StringRef GroupName,
                                    bool Enabled)
   : TimeRegion(!Enabled ? nullptr : &NamedGroupedTimers->get(Name, GroupName)){}

lib/Target/Hexagon/HexagonGenInsert.cpp

@@ -1474,8 +1474,6 @@ bool HexagonGenInsert::runOnMachineFunction(MachineFunction &MF) {
 
   bool Timing = OptTiming, TimingDetail = Timing && OptTimingDetail;
   bool Changed = false;
-  TimerGroup __G("hexinsert");
-  NamedRegionTimer __T("hexinsert", Timing && !TimingDetail);
 
   // Sanity check: one, but not both.
   assert(!OptSelectAll0 || !OptSelectHas0);