Fixed crashes when compiling interpret test.

gen/arrays.cpp

@@ -75,7 +75,7 @@ void DtoArrayInit(Loc& loc, DValue* array, DValue* value)
     LLValue* val;
 
     // give slices and complex values storage (and thus an address to pass)
-    if (value->isSlice())
+    if (value->isSlice() || value->type->ty == Tdelegate)
     {
         val = DtoAlloca(value->getType(), ".tmpparam");
         DVarValue lval(value->getType(), val);

gen/dvalue.cpp

@@ -13,11 +13,15 @@
 
 DVarValue::DVarValue(Type* t, VarDeclaration* vd, LLValue* llvmValue)
 : DValue(t), var(vd), val(llvmValue)
-{}
+{
+    assert(isaPointer(llvmValue));
+}
 
 DVarValue::DVarValue(Type* t, LLValue* llvmValue)
 : DValue(t), var(0), val(llvmValue)
-{}
+{
+    assert(isaPointer(llvmValue));
+}
 
 LLValue* DVarValue::getLVal()
 {

gen/tocall.cpp

@@ -356,10 +356,14 @@ DValue* DtoCallFunction(Loc& loc, Type* resulttype, DValue* fnval, Expressions*
         // ... or a nested function context arg
         else if (nestedcall)
         {
+            if (dfnval) {
                 LLValue* contextptr = DtoNestedContext(loc, dfnval->func);
                 contextptr = DtoBitCast(contextptr, getVoidPtrType());
-            ++argiter;
                 args.push_back(contextptr);
+            } else {
+                args.push_back(llvm::UndefValue::get(getVoidPtrType()));
+            }
+            ++argiter;
         }
         else
         {

ir/irvar.cpp

@@ -31,6 +31,7 @@ IrGlobal::IrGlobal(VarDeclaration* v): IrVar(v),
 IrLocal::IrLocal(VarDeclaration* v) : IrVar(v)
 {
     nestedIndex = -1;
+    byref = false;
 }
 
 //////////////////////////////////////////////////////////////////////////////