Subzero: Rewrite the pass timing infrastructure.

src/IceDefs.h

 //===- subzero/src/IceDefs.h - Common Subzero declaraions -------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares various useful types and classes that have
@@ skipping 85 matching lines @@
   IceV_Instructions = 1 << 0,
   IceV_Deleted = 1 << 1,
   IceV_InstNumbers = 1 << 2,
   IceV_Preds = 1 << 3,
   IceV_Succs = 1 << 4,
   IceV_Liveness = 1 << 5,
   IceV_RegManager = 1 << 6,
   IceV_RegOrigins = 1 << 7,
   IceV_LinearScan = 1 << 8,
   IceV_Frame = 1 << 9,
-  IceV_Timing = 1 << 10,
-  IceV_AddrOpt = 1 << 11,
+  IceV_AddrOpt = 1 << 10,
   IceV_All = ~IceV_None,
-  IceV_Most = IceV_All & ~(IceV_Timing | IceV_LinearScan)
+  IceV_Most = IceV_All & ~IceV_LinearScan
 };
 typedef uint32_t VerboseMask;
 
 typedef llvm::raw_ostream Ostream;
 
-// TODO: Implement in terms of std::chrono after switching to C++11.
-class Timer {
-public:
-  Timer() : Start(llvm::TimeRecord::getCurrentTime(false)) {}
-  uint64_t getElapsedNs() const { return getElapsedSec() * 1000 * 1000 * 1000; }
-  uint64_t getElapsedUs() const { return getElapsedSec() * 1000 * 1000; }
-  uint64_t getElapsedMs() const { return getElapsedSec() * 1000; }
-  double getElapsedSec() const {
-    llvm::TimeRecord End = llvm::TimeRecord::getCurrentTime(false);
-    return End.getWallTime() - Start.getWallTime();
-  }
-  void printElapsedUs(GlobalContext *Ctx, const IceString &Tag) const;
-
-private:
-  const llvm::TimeRecord Start;
-  Timer(const Timer &) LLVM_DELETED_FUNCTION;
-  Timer &operator=(const Timer &) LLVM_DELETED_FUNCTION;
-};
-
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEDEFS_H