Subzero: Add rudimentary statistics on generated code.

src/IceGlobalContext.cpp

Index: src/IceGlobalContext.cpp
diff --git a/src/IceGlobalContext.cpp b/src/IceGlobalContext.cpp
index f3982554bdd9902c28c45a016022a7dfaae185b9..aa14e4b37bc742a80bf9ff901bbfc9a246781da0 100644
--- a/src/IceGlobalContext.cpp
+++ b/src/IceGlobalContext.cpp
@@ -376,6 +376,13 @@ ConstantList GlobalContext::getConstantPool(Type Ty) const {
   llvm_unreachable("Unknown type");
 }
 
+void GlobalContext::dumpStats(const IceString &Name) {
+  if (Flags.DumpStats) {
+    StatsFunction.dump(Name, getStrDump());
+    StatsCumulative.dump("_TOTAL_", getStrDump());
+  }
+}
+
 void Timer::printElapsedUs(GlobalContext *Ctx, const IceString &Tag) const {
   if (Ctx->isVerbose(IceV_Timing)) {
     // Prefixing with '#' allows timing strings to be included