fdr: move long literal handling into Rose

Move the hash table used for long literal support in streaming mode from
FDR to Rose, and introduce new instructions CHECK_LONG_LIT and
CHECK_LONG_LIT_NOCASE for doing literal confirm for long literals.

This simplifies FDR confirm, and guarantees that HWLM matchers will only
be used for literals < 256 bytes long.

src/hwlm/hwlm_literal.h

@@ -41,6 +41,9 @@
 
 namespace ue2 {
 
+/** \brief Max length of the literal passed to HWLM. */
+#define HWLM_LITERAL_MAX_LEN 255
+
 /** \brief Max length of the hwlmLiteral::msk and hwlmLiteral::cmp vectors. */
 #define HWLM_MASKLEN 8