[PATCH 5.7.0 DOC] Fix perlcompile vagueness

I figure the documentation should make us sound like we know what we're
talking about. :)

--- pod/perlcompile.pod~	Fri Mar 17 03:44:16 2000
+++ pod/perlcompile.pod	Fri Mar 17 03:46:17 2000
@@ -306,8 +306,9 @@
 
 =item B::Bblock
 
-This module is used by the B::CC back end.  It walks "basic blocks",
-whatever they may be.
+This module is used by the B::CC back end.  It walks "basic blocks".
+A basic block is a series of operations which is known to execute from
+start to finish, with no possiblity of branching or halting.
 
 =item B::Bytecode
 

-- 
Hiccups, i'm not in the socket on the same theory...
        -- Megahal (trained on asr), 1998-11-06

• [PATCH 5.7.0 DOC] Fix perlcompile vagueness by simon