Introduce model of global initializers in Subzero.

src/llvm2ice.cpp

Index: src/llvm2ice.cpp
diff --git a/src/llvm2ice.cpp b/src/llvm2ice.cpp
index f95c02eef428d02cd39c3d939639007df7096b23..fbf5e23ad984bf47a77ac816764632c61afb05db 100644
--- a/src/llvm2ice.cpp
+++ b/src/llvm2ice.cpp
@@ -135,9 +135,20 @@ static cl::opt<bool>
     UseIntegratedAssembler("integrated-as",
                            cl::desc("Use integrated assembler (default yes)"),
                            cl::init(true));
+
 static cl::alias UseIas("ias", cl::desc("Alias for -integrated-as"),
                         cl::NotHidden, cl::aliasopt(UseIntegratedAssembler));
 
+static cl::opt<bool> AlwaysExitSuccess(
+    "exit-success", cl::desc("Exit with success status, even if errors found"),
+    cl::init(false));
+
+static int GetReturnValue(int Val) {
+  if (AlwaysExitSuccess)
+    return 0;
+  return Val;
+}
+
 int main(int argc, char **argv) {
 
   cl::ParseCommandLineOptions(argc, argv);
@@ -192,7 +203,7 @@ int main(int argc, char **argv) {
 
     if (!Mod) {
       Err.print(argv[0], errs());
-      return 1;
+      return GetReturnValue(1);
     }
 
     Ice::Converter Converter(Mod, &Ctx, Flags);
@@ -203,5 +214,5 @@ int main(int argc, char **argv) {
     Ctx.dumpTimers();
   const bool FinalStats = true;
   Ctx.dumpStats("_FINAL_", FinalStats);
-  return ErrorStatus;
+  return GetReturnValue(ErrorStatus);
 }