Thanks to Javier Guerra Giraldez.

Reported by caohongqing.

It's rarely used and properly compiling it would be difficult.

10x faster on loop with t[#t+1] = x idiom. Also used by table.insert.

It's not 2005 anymore.

Up to 40% faster on hash-intensive benchmarks.
With some ideas from Sokolov Yura.

Thanks to Stefan Hett.

Reported by jnozsc.

Reported by Changochen.

Reported by Arseny Vakhrushev.
Analysis and fix contributed by Peter Cawley.

Reported by Jason Carr.

An unused guarded CONV int.num cannot be omitted in general.

Reported by Jason Carr.

This reverts commit 3ad7e2e.

This issue has already been fixed in LuaJIT/LuaJIT.

…r_fastcmp() when macro LUAJIT_USE_VALGRIND is defined."

This reverts commit 4e9ce0f.

The fuction str_fastcmp has been dropped in LuaJIT/LuaJIT.  Also
remove note about this fix from README.md.

This reverts commit 4589430.

…`__attribute((aligned(N)))` and `#pragma`."

This reverts commit 2d33927.

Reverts state back to LuaJIT/v2.1 way of parsing attributes.

…ug had appeared in commit 7923c63."

This reverts commit b982ebb.

… crc32 when -msse4.2 is specified."

This reverts commit 7923c63.

…the full string comparison on hash collisions. thanks Shuxin Yang for the patch."

This reverts commit 0089509.

…ed."

This partially reverts commit 6315a75
since lj_str_new no longer has the fast path.

This merge makes jit.prngstate unusable since the prng usage has
changed in LuaJIT/LuaJIT.

TODO:

- Make jit.prngstate usable with the new prng functionality
- Reinstate the string hashing optimisations

This change splits out the PRNG so that the PRNG used by the JIT
compiler can be overridden without affecting the PRNG for the
allocator.

The API is changed to reflect the wider PRNG data, which is now 256
bits.  jit.prngstate returns an array with 8 32-bit integers and
similarly, it can be overridden with an array of up to 8 32-bit
integers.

Tests and README.md have been updated to reflect this change.