rose: simplify long lit table, add bloom filter

Replaces the original long lit hash table (used in streaming mode) with a
smaller, simpler linear probing approach. Adds a bloom filter in front
of it to reduce time spent on false positives.

Sizing of both the hash table and bloom filter are done based on max
load.

src/util/bitutils.h

@@ -70,6 +70,7 @@
 #define CASE_BIT          0x20
 #define CASE_CLEAR        0xdf
 #define DOUBLE_CASE_CLEAR 0xdfdf
+#define OCTO_CASE_CLEAR   0xdfdfdfdfdfdfdfdfULL
 
 static really_inline
 u32 clz32(u32 x) {