+ Get absolute function pointers from the register table, to save
+ code space. On x86,
+
+ jmp *-12(%ebx)
+
+ is shorter than
+
+ jmp absolute_address
+
+ as long as the offset is within the range of a signed byte
+ (-128..+127). So we pick some common absolute_addresses and put
+ them in the register table. As a bonus, linking time should also
+ be reduced.
+
+ Other possible candidates in order of importance:
+
+ stg_upd_frame_info
+ stg_CAF_BLACKHOLE_info
+ stg_IND_STATIC_info
+
+ anything else probably isn't worth the effort.
+
+ -------------------------------------------------------------------------- */
+
+
+#define FunReg ((StgFunTable *)((void *)BaseReg - sizeof(StgFunTable)))
+
+#define stg_chk_0 (FunReg->stgChk0)
+#define stg_chk_1 (FunReg->stgChk1)
+#define stg_gc_enter_1 (FunReg->stgGCEnter1)
+#define stg_update_PAP (FunReg->stgUpdatePAP)
+
+/* -----------------------------------------------------------------------------