For the outermost function needing a context frame, use the address of that

frame as the nest argument instead of the address of a single-element list
containing only that frame address.
This saves some stack space and reduces memory accesses.

ir/irfunction.cpp

@@ -109,6 +109,7 @@ IrFunction::IrFunction(FuncDeclaration* fd)
     retArg = NULL;
     thisArg = NULL;
     nestArg = NULL;
+    elidedCtxList = false;
 
     nestedVar = NULL;
     framesType = NULL;