clean up leave_scope()

Rather than having a whole bunch of casting macros like

    #define ARG0_SV  MUTABLE_SV(arg0.any_ptr)

just add extra pointer types to the ANY union and directly do

    arg0.any_sv

etc.

Also, rename arg0, arg1, arg2 to a0, a1, a2 and reverse their order;
previously if 3 args A,B,C were pushed onto the savestack, they were
popped as a0=C, a1=B, a2=A; now do it as a0=A, a1=B, a2=C. The previous
(rather odd) order was an artifact of the old way leave_scope() used to
pop its args.

There should be no functional changes.

1 files changed, 7 insertions, 0 deletions

diff --git a/perl.h b/perl.h
index ac302bd86d..8a2e1f1587 100644
--- a/perl.h
+++ b/perl.h
@@ -3796,6 +3796,13 @@ UNION_ANY_DEFINITION;
 #else
 union any {
     void*	any_ptr;
+    SV*         any_sv;
+    SV**        any_svp;
+    GV*         any_gv;
+    AV*         any_av;
+    HV*         any_hv;
+    char*       any_pv;
+    char**      any_pvp;
     I32		any_i32;
     U32		any_u32;
     IV		any_iv;