cmd/gc: update issue tracker link

Updated the issue tracker link the compiler prints out
when asking for a bug report after an internal error.

Change-Id: I092b118130f131c6344d9d058bea4ad6379032b8
Reviewed-on: https://go-review.googlesource.com/2218Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/gc/subr.c

@@ -250,7 +250,7 @@ fatal(char *fmt, ...)
 	if(strncmp(getgoversion(), "release", 7) == 0) {
 		print("\n");
 		print("Please file a bug report including a short program that triggers the error.\n");
-		print("http://code.google.com/p/go/issues/entry?template=compilerbug\n");
+		print("https://golang.org/issue/new\n");
 	}
 	hcrash();
 	errorexit();