Created Ice::Instrumentation base class and accompanying hooks.

src/IceGlobalContext.cpp

 //===- subzero/src/IceGlobalContext.cpp - Global context defs -------------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 468 matching lines @@
 
   saveBlockInfoPtrs();
   // If we need to shuffle the layout of global variables, shuffle them now.
   if (getFlags().getReorderGlobalVariables()) {
     // Create a random number generator for global variable reordering.
     RandomNumberGenerator RNG(getFlags().getRandomSeed(),
                               RPE_GlobalVariableReordering);
     RandomShuffle(Globals.begin(), Globals.end(),
                   [&RNG](int N) { return (uint32_t)RNG.next(N); });
   }
+
+  if (Instrumentor)

[Karl, 2016/06/06 22:27:02]

Again, enclose code inside a conditional on BuildDefs::minimal().

[tlively, 2016/06/07 00:43:05]

Done.

+    Instrumentor->instrumentGlobals();
+
   DataLowering->lowerGlobals(Globals, SectionSuffix);
   if (ProfileBlockInfos.empty() && DisposeGlobalVariablesAfterLowering) {
     Globals.clearAndPurge();
   } else {
     Globals.clear();
   }
 }
 
 void GlobalContext::lowerProfileData() {
   // ProfileBlockInfoVarDecl is initialized in the constructor, and will only
@@ skipping 534 matching lines @@
 void TimerMarker::pushCfg(const Cfg *Func) {
   Ctx = Func->getContext();
   Active = Func->getFocusedTiming() || getFlags().getSubzeroTimingEnabled();
   if (Active)
     Ctx->pushTimer(ID, StackID);
 }
 
 ICE_TLS_DEFINE_FIELD(GlobalContext::ThreadContext *, GlobalContext, TLS);
 
 } // end of namespace Ice