FDR: Squash buckets of included literals in FDR confirm

- Change the compile of literal matchers to two passes.
 - Reverse the bucket assignment in FDR, bucket with longer literals has
   smaller bucket id.
 - Squash the buckets of included literals and jump to the the program of
   included literals directly from parent literal program without going
   through FDR confirm for included iterals.

src/scratch.c

@@ -136,6 +136,7 @@ hs_error_t alloc_scratch(const hs_scratch_t *proto, hs_scratch_t **scratch) {
     s->in_use = 0;
     s->scratchSize = alloc_size;
     s->scratch_alloc = (char *)s_tmp;
+    s->fdr_conf = NULL;
 
     // each of these is at an offset from the previous
     char *current = (char *)s + sizeof(*s);