Turn off dump/emit routines when building minimal subzero.

src/IceGlobalContext.cpp

Index: src/IceGlobalContext.cpp
diff --git a/src/IceGlobalContext.cpp b/src/IceGlobalContext.cpp
index 951de47e9e1afe433c8544846b83a8d4b94b6a89..95378caa870d7951fc7527eadf0e60906b40be09 100644
--- a/src/IceGlobalContext.cpp
+++ b/src/IceGlobalContext.cpp
@@ -439,6 +439,8 @@ void GlobalContext::setTimerName(TimerStackIdT StackID,
 }
 
 void GlobalContext::dumpStats(const IceString &Name, bool Final) {
+  if (!ALLOW_DUMP)
+    return;
   if (Flags.DumpStats) {
     if (Final) {
       StatsCumulative.dump(Name, getStrDump());
@@ -450,6 +452,8 @@ void GlobalContext::dumpStats(const IceString &Name, bool Final) {
 }
 
 void GlobalContext::dumpTimers(TimerStackIdT StackID, bool DumpCumulative) {
+  if (!ALLOW_DUMP)
+    return;
   assert(Timers.size() > StackID);
   Timers[StackID].dump(getStrDump(), DumpCumulative);
 }