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[as] Define regmode

When we are in regmode % can initiate a symbol name, but when we
aren't it cannot. This is done to allow % to be the modulo operation
at the same time that it is part of register names.

--- a/as/expr.c

+++ b/as/expr.c

@@ -21,6 +21,7 @@

 static char yytext[INTIDENTSIZ+1], *textp, *endp;

 static size_t yylen;

 static union yylval yylval;

+static int regmode;

 #define accept(t) (yytoken == (t) ? next() : 0)

@@ -318,6 +319,9 @@

 	case '\'':

 		c = character();

 		break;

+	case '%':

+		c = (regmode ? iden : operator)();

+		break;

 	case '_':

 		c = iden();

 		break;

@@ -515,6 +519,7 @@

 	int op;

 	Node *np;

+	regmode = 0;

 	np = and();

 	for (;;) {

 		switch (op = yytoken) {

@@ -535,6 +540,7 @@

 	int imm = 0;

 	Node *np;

+	regmode = 1;

 	textp = *strp;

 	switch (next()) {

 	case EOS: