For PR9480:

--- Merging r127241 into '.':
U    lib/Support/regcomp.c



git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_29@127631 91177308-0d34-0410-b5e6-96231b3b80d8

Author: isanbard

lib/Support/regcomp.c

@@ -780,7 +780,7 @@ p_b_cclass(struct parse *p, cset *cs)
 	const char *u;
 	char c;
 
-	while (MORE() && isalpha(PEEK()))
+	while (MORE() && isalpha((uch)PEEK()))
 		NEXT();
 	len = p->next - sp;
 	for (cp = cclasses; cp->name != NULL; cp++)