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cc1: Do not use input->begin in loops

Since input value can be modified in the loops where
a call to moreinput() can happen it is better to use
input->p because otherwise we can have a dangling
pointer.

--- a/src/cmd/cc/cc1/lex.c

+++ b/src/cmd/cc/cc1/lex.c

@@ -902,8 +902,7 @@

 	if (!input)

 		return;

-	input->begin = input->p;

-	for (c = yytoken; ; c = *input->begin++) {

+	for (c = yytoken; ; c = *input->p++) {

 		switch (safe) {

 		case END_COMP:

 			if (c == '}')

@@ -926,7 +925,10 @@

 			exit(1);

 	}

 jump:

+	input->begin = input->p;

 	yytoken = c;

+	yytext[0] = c;

+	yytext[1] = '\0';

 	exit(EXIT_FAILURE);

 	/*