z80: remove remaining indirections in execute calls

We now have a stable ABI that is pretty cleared up...

blk/283

@@ -1,14 +1,14 @@
 H@ ORG !
-0 JPnn,       ( 00, main )     NOP, NOP, NOP, ( 03, unused )
-NOP, NOP,     ( 06, unused )   NOP, NOP,     ( 08, LATEST )
+0 JPnn, ( 00, main ) NOP, NOP, NOP, ( unused )
+NOP, NOP, ( unused ) NOP, NOP, ( 08, LATEST )
 NOP, NOP, NOP, NOP, NOP, NOP, NOP, ( 0a, unused )
-0 JPnn,       ( 11, pushRS )   0 JPnn,       ( 14, popRS )
-NOP, NOP, NOP, ( 17, unused )
-0 JPnn,       ( 1a, next )     0 JPnn,       ( unused )
-NOP, NOP, NOP, NOP, ( 20, unused )
-NOP, NOP, NOP, NOP, ( 24, unused )
-0 JPnn,       ( RST 28 )
-NOP, NOP, NOP, NOP, NOP, ( 2b, unused )
-0 JPnn,       ( RST 30 )
-0 JPnn,       ( 33, execute )  NOP, NOP,     ( unused )
-0 JPnn,       ( RST 38 )
+0 JPnn, ( 11, pushRS ) 0 JPnn, ( 14, popRS )
+NOP, NOP, NOP, ( unused )
+0 JPnn, ( 1a, next ) NOP, NOP, NOP, ( unused )
+NOP, NOP, NOP, NOP, ( unused )
+NOP, NOP, NOP, NOP, ( unused )
+0 JPnn, ( RST 28 )
+NOP, NOP, NOP, NOP, NOP, ( unused )
+0 JPnn, ( RST 30 )
+NOP, NOP, NOP, NOP, NOP, ( unused )
+0 JPnn, ( RST 38 )

blk/298

@@ -3,7 +3,7 @@ lblofl BSET ( abortUnderflow )
     HL PC 7 - LDddnn,
     DE RAMSTART 0x02 + LDdd(nn),   ( RAM+02 == CURRENT )
     lblfind @ CALLnn,
-    0x33 BJP,   ( 33 == execute )
+    JR, L2 FWR ( execute, B301 )
 
 
 

blk/299

@@ -13,4 +13,4 @@ PC ORG @ 1 + ! ( main )
     EXDEHL,
     HL L1 @ LDddnn,
     lblfind @ CALLnn,
-    0x33 BJP,   ( 33 == execute )
+    JR, L1 FWR ( execute, B301 )

blk/301

@@ -1,4 +1,5 @@
-lblexec BSET PC ORG @ 0x34 + ! ( execute. DE -> wordref )
+lblexec BSET L1 FSET ( B299 ) L2 FSET ( B298 )
+    ( DE -> wordref )
     ( We don't apply BIN( reliably on stable ABI stuff, we
       might need to adjust addr. Ugly, but well... )
     BIN( @ [IF]