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[as-z80] Allow register names with '

Z80 has a register called AF', so we need this character. This
is a temporary patch, because the correct solution is to integrate
reg() and iden() and make % part of the register name.

--- a/as/expr.c

+++ b/as/expr.c

@@ -189,6 +189,7 @@

 		if (isalnum(c))

 			continue;

 		switch (c) {

+		case '\'':

 		case '_':

 		case '-':

 		case '.':

@@ -271,7 +272,7 @@

 	if (*textp == '%')

 		++textp, ++endp;

-	while (isalnum(c = *endp))

+	while (isalnum(c = *endp) || c == '\'')

 		++endp;

 	tok2str();

 	yylval.sym = lookup(yytext);

--- a/as/target/z80/proc.c

+++ b/as/target/z80/proc.c

@@ -39,7 +39,7 @@

 		"R", AREG_R,

 		"I", AREG_I,

-		"AF_", AREG_AF_,

+		"AF'", AREG_AF_,

 		NULL,

 	}, *bp;