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cc1: Add comment about error recovery

The code in string has a way to re-synchronize when a string
is too long, but it was not obvious what the code was trying
to do.

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

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

@@ -558,6 +558,7 @@

 			c = escape();

 		if (bp == &yytext[STRINGSIZ+1]) {

+			/* too long, ignore everything until next quote */

 			for (++input->p; *input->p != '"'; ++input->p) {

 				if (*input->p == '\\')

 					++input->p;