Implement instruction usage histogram about rv32emu

[jserv]

The author of rv8 showed a neat technique to render histogram. See microsoft/mimalloc#529

[jserv]

register usage histogram generated by rv8.

[qwe661234]

I imported the LRU cache in this commit, so maybe we can display cache information in the profiling tool, such as cache size, cache hit rate, cache miss rate, cache hit times of a specific basic block, and the PC of the basic block.
For example,

Total cache access: xxx
Cache miss rate: xx.x%
Cache hit rate: xx.x%
Block PC   |   hit times   |   instruction in this block    |
---------  | ------------  |  ----------------------------  |
    0x4    | xxx [xx.x%]   |         LW ADD  BEQ            |
.
.
.

[jserv]

Check the way how mimalloc displays the internal information depending on environment variable MIMALLOC_VERBOSE and MIMALLOC_SHOW_STATS. Of course, the feature can be turned off via build-time flags.

[jserv]

It is feasible to reuse existing map for LRU cache implementation. See https://jaeyu.wordpress.com/2014/04/15/lru-cache-in-c/

[qwe661234]

It is feasible to reuse existing map for LRU cache implementation. See https://jaeyu.wordpress.com/2014/04/15/lru-cache-in-c/

I try to integrate the existing map for LRU cache implementation, but the performance is worser than original version of LRU cache.

Performance of running CoreMarking

Mircoprocessor: Core i7-8700, Compiiler: gcc-12

1. LRU cache with map: 464.427307 (Iterations/Sec)
2. LRU cache without map: 978.822116 (Iterations/Sec)

[jserv]

I imported the LRU cache in this commit,

The memory management concerns on basic block should appear in #105 .
Here, we still work on the statistics.

[jserv]

rv64_emualtor comes with an ELF file instruction frequency analyzer. See rv_analyzer, which looks quite straightforward.