Add support for putting NamedRegionTimers in TimerGroups, and

use a timer group for the timers in SelectionDAGISel. Also,
Split scheduling out from emitting, to give each their own
timer.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53476 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/Timer.h

@@ -132,6 +132,8 @@ public:
 ///
 struct NamedRegionTimer : public TimeRegion {
   explicit NamedRegionTimer(const std::string &Name);
+  explicit NamedRegionTimer(const std::string &Name,
+                            const std::string &GroupName);
 };