add new Literal API for pure literal expressions:

Design compile time api hs_compile_lit() and hs_compile_lit_multi()
to handle pure literal pattern sets. Corresponding option --literal-on
is added for hyperscan testing suites. Extended parameters and part of
flags are not supported for this api.

src/fdr/fdr_compile.cpp

@@ -807,9 +807,6 @@ void findIncludedLits(vector<hwlmLiteral> &lits,
         for (size_t i = 0; i < cnt; i++) {
             u32 bucket1 = group[i].first;
             u32 id1 = group[i].second;
-            if (lits[id1].pure) {
-                continue;
-            }
             buildSquashMask(lits, id1, bucket1, i + 1, group, parent_map,
                             exception_map);
         }

src/fdr/fdr_confirm.h

@@ -62,7 +62,6 @@ struct LitInfo {
     u8 size;
     u8 flags; //!< bitfield of flags from FDR_LIT_FLAG_* above.
     u8 next;
-    u8 pure; //!< The pass-on of pure flag from hwlmLiteral.
 };
 
 #define FDRC_FLAG_NO_CONFIRM 1

src/fdr/fdr_confirm_compile.cpp

@@ -87,7 +87,6 @@ void fillLitInfo(const vector<hwlmLiteral> &lits, vector<LitInfo> &tmpLitInfo,
         info.flags = flags;
         info.size = verify_u8(max(lit.msk.size(), lit.s.size()));
         info.groups = lit.groups;
-        info.pure = lit.pure;
 
         // these are built up assuming a LE machine
         CONF_TYPE msk = all_ones;

src/fdr/fdr_confirm_runtime.h

@@ -65,7 +65,6 @@ void confWithBit(const struct FDRConfirm *fdrc, const struct FDR_Runtime_Args *a
     u8 oldNext; // initialized in loop
     do {
         assert(ISALIGNED(li));
-        scratch->pure = li->pure;
 
         if (unlikely((conf_key & li->msk) != li->v)) {
             goto out;
@@ -100,7 +99,6 @@ void confWithBit(const struct FDRConfirm *fdrc, const struct FDR_Runtime_Args *a
         li++;
     } while (oldNext);
     scratch->fdr_conf = NULL;
-    scratch->pure = 0;
 }
 
 #endif