Make a function for get_itbl, rather than using a CPP macro

This has several advantages:
* It can be called from gdb
* There is more type information for the user, and type checking
  for the compiler
* Less opportunity for things to go wrong, e.g. due to missing
  parentheses or repeated execution

The sizes of the non-debug .o files hasn't changed (other than
Inlines.o), so I'm pretty sure the compiled code is identical.

1 files changed, 1 insertions, 1 deletions

diff --git a/rts/Printer.c b/rts/Printer.c
index a7ce367833..737fba4f20 100644
--- a/rts/Printer.c
+++ b/rts/Printer.c
@@ -91,7 +91,7 @@ printThunkPayload( StgThunk *obj )
     StgWord i, j;
     const StgInfoTable* info;
 
-    info = get_itbl(obj);
+    info = get_itbl((StgClosure *)obj);
     for (i = 0; i < info->layout.payload.ptrs; ++i) {
         debugBelch(", ");
         printPtr((StgPtr)obj->payload[i]);