Subzero: Rewrite the pass timing infrastructure.

src/IceClFlags.h

Index: src/IceClFlags.h
diff --git a/src/IceClFlags.h b/src/IceClFlags.h
index d6c232f2ceef84660e205ad4e9482352294ae77a..9ab79aa58dd37800b4a4d777847aeab1e8c13e53 100644
--- a/src/IceClFlags.h
+++ b/src/IceClFlags.h
@@ -22,13 +22,11 @@ namespace Ice {
 class ClFlags {
 public:
   ClFlags()
-      : DisableInternal(false), SubzeroTimingEnabled(false),
-        DisableTranslation(false), DisableGlobals(false),
-        FunctionSections(false), UseIntegratedAssembler(false),
-        UseSandboxing(false), DumpStats(false), DefaultGlobalPrefix(""),
-        DefaultFunctionPrefix("") {}
+      : DisableInternal(false), DisableTranslation(false),
+        DisableGlobals(false), FunctionSections(false),
+        UseIntegratedAssembler(false), UseSandboxing(false), DumpStats(false),
+        DefaultGlobalPrefix(""), DefaultFunctionPrefix("") {}
   bool DisableInternal;
-  bool SubzeroTimingEnabled;
   bool DisableTranslation;
   bool DisableGlobals;
   bool FunctionSections;