Subzero: Emit functions and global initializers in a separate thread.

src/IceConverter.cpp

Index: src/IceConverter.cpp
diff --git a/src/IceConverter.cpp b/src/IceConverter.cpp
index 5316db6a07935fd89372dcc2112172ed0576a8db..ea352dde11a2ed27d7f59e770f573909995119b7 100644
--- a/src/IceConverter.cpp
+++ b/src/IceConverter.cpp
@@ -84,7 +84,9 @@ public:
       : LLVM2ICEConverter(Converter), Func(nullptr) {}
 
   void convertFunction(const Function *F) {
-    Func = Ice::Cfg::create(Ctx);
+    if (Ctx->isIRGenerationDisabled())
+      return;
+    Func = Ice::Cfg::create(Ctx, Converter.getNextSequenceNumber());
     Ice::Cfg::setCurrentCfg(Func.get());
 
     VarMap.clear();
@@ -801,7 +803,7 @@ void LLVM2ICEGlobalsConverter::addGlobalInitializer(
 namespace Ice {
 
 void Converter::nameUnnamedGlobalVariables(Module *Mod) {
-  const IceString &GlobalPrefix = Flags.DefaultGlobalPrefix;
+  const IceString &GlobalPrefix = Ctx->getFlags().DefaultGlobalPrefix;
   if (GlobalPrefix.empty())
     return;
   uint32_t NameIndex = 0;
@@ -816,7 +818,7 @@ void Converter::nameUnnamedGlobalVariables(Module *Mod) {
 }
 
 void Converter::nameUnnamedFunctions(Module *Mod) {
-  const IceString &FunctionPrefix = Flags.DefaultFunctionPrefix;
+  const IceString &FunctionPrefix = Ctx->getFlags().DefaultFunctionPrefix;
   if (FunctionPrefix.empty())
     return;
   uint32_t NameIndex = 0;
@@ -883,8 +885,8 @@ void Converter::installGlobalDeclarations(Module *Mod) {
 
 void Converter::convertGlobals(Module *Mod) {
   LLVM2ICEGlobalsConverter GlobalsConverter(*this);
-  VariableDeclarationList VariableDeclarations;
-  GlobalsConverter.convertGlobalsToIce(Mod, VariableDeclarations);
+  VariableDeclarationList *VariableDeclarations = new VariableDeclarationList;
+  GlobalsConverter.convertGlobalsToIce(Mod, *VariableDeclarations);
   lowerGlobals(VariableDeclarations);
 }