Remove unnecessary commentary and white space differences from

1_29-branch.  Depend on YYERROR_VERBOSE, not defined (YYERROR_VERBOSE).

(union yyalloc, YYSTACK_GAP_MAX, YYSTACK_BYTES, YYCOPY,
YYSTACK_RELOCATE): Do not define if yyoverflow is defined, or
if this is a C++ parser and YYSTYPE or YYLTYPE has nontrivial
constructors or destructors.

(yyparse) [! defined YYSTACK_RELOCATE]: Do not relocate the stack.

data/bison.simple

@@ -89,6 +89,13 @@ m4_divert(0)dnl
    It was written by Richard Stallman by simplifying the hairy parser
    used when %semantic_parser is specified.  */
 
+/* All symbols defined below should begin with yy or YY, to avoid
+   infringing on user name space.  This should be done even for local
+   variables, as they might otherwise be expanded by user macros.
+   There are some unavoidable exceptions within include files to
+   define necessary library symbols; they are noted "INFRINGES ON
+   USER NAME SPACE" below.  */
+
 /* Identify Bison output.  */
 #define YYBISON	1
 
@@ -151,14 +158,7 @@ typedef struct yyltype
 /* Line __line__ of __file__.  */
 #line __oline__ "__ofile__"
 
-/* All symbols defined below should begin with yy or YY, to avoid
-   infringing on user name space.  This should be done even for local
-   variables, as they might otherwise be expanded by user macros.
-   There are some unavoidable exceptions within include files to
-   define necessary library symbols; they are noted "INFRINGES ON
-   USER NAME SPACE" below.  */
-
-#if ! defined (yyoverflow) || defined (YYERROR_VERBOSE)
+#if ! defined (yyoverflow) || YYERROR_VERBOSE
 
 /* The parser invokes alloca or malloc; define the necessary symbols.  */
 
@@ -187,6 +187,12 @@ typedef struct yyltype
 #  define YYSTACK_ALLOC malloc
 #  define YYSTACK_FREE free
 # endif
+#endif /* ! defined (yyoverflow) || YYERROR_VERBOSE */
+
+
+#if (! defined (yyoverflow) \
+     && (! defined (__cplusplus) \
+	 || (YYLTYPE_IS_TRIVIAL && YYSTYPE_IS_TRIVIAL)))
 
 /* A type that is properly aligned for any stack member.  */
 union yyalloc
@@ -247,7 +253,7 @@ union yyalloc
       }									\
     while (0)
 
-#endif /* ! defined (yyoverflow) || YYERROR_VERBOSE */
+#endif
 
 /* Tokens.  */
 b4_token_defines(b4_tokens)
@@ -469,8 +475,8 @@ do {						\
   if (yydebug)					\
     YYFPRINTF Args;				\
 } while (0)
-/* Nonzero means print parse trace.  Since this is uninitialized, it
-   does not stop multiple parsers from coexisting.  */
+/* Nonzero means print parse trace.  It is left uninitialized so that
+   multiple parsers can coexist.  */
 int yydebug;
 #else /* !YYDEBUG */
 # define YYDPRINTF(Args)
@@ -738,6 +744,9 @@ yyparse (YYPARSE_PARAM_ARG)
 	yyvs = yyvs1;
       }
 #else /* no yyoverflow */
+# ifndef YYSTACK_RELOCATE
+      goto yyoverflowlab;
+# else
       /* Extend the stack our own way.  */
       if (yystacksize >= YYMAXDEPTH)
 	goto yyoverflowlab;
@@ -760,6 +769,7 @@ yyparse (YYPARSE_PARAM_ARG)
 	if (yyss1 != yyssa)
 	  YYSTACK_FREE (yyss1);
       }
+# endif
 #endif /* no yyoverflow */
 
       yyssp = yyss + yysize - 1;