make ConstRef based on u32 instead of intx::U24

[Robbepop]

This allows us to remove intx dependency. This was an oversight in a previous PR.

[paritytech-cicd-pr]

BENCHMARKS

	NATIVE			WASMTIME
BENCHMARK	MASTER	PR	DIFF	MASTER	PR	DIFF	WASMTIME OVERHEAD
execute/ bare_call_0	1.54ms	1.55ms	🔴 1.24%	1.07ms	1.03ms	🟢 -3.05%	🟢 -33%
execute/ bare_call_0/typed	1.15ms	1.19ms	🔴 3.81%	685.87µs	657.30µs	🟢 -4.24%	🟢 -45%
execute/ bare_call_1	1.60ms	1.59ms	🟢 0.85%	1.19ms	1.18ms	🟢 -1.08%	🟢 -26%
execute/ bare_call_16	2.53ms	2.48ms	🟢 -2.33%	3.31ms	3.26ms	🟢 -1.53%	🟢 31%
execute/ bare_call_16/typed	1.51ms	1.52ms	⚪ 0.00%	1.82ms	1.65ms	🟢 -9.41%	🟢 9%
execute/ bare_call_1/typed	1.25ms	1.26ms	⚪ 1.07%	1.01ms	981.65µs	🟢 -2.58%	🟢 -22%
execute/ bare_call_4	1.72ms	1.74ms	⚪ 1.50%	1.64ms	1.63ms	🟢 0.86%	🟢 -6%
execute/ bare_call_4/typed	1.22ms	1.21ms	⚪ -0.49%	964.78µs	903.45µs	🟢 -6.41%	🟢 -25%
execute/ br_table	1.34ms	1.34ms	⚪ 0.33%	1.21ms	1.21ms	⚪ 0.29%	🟢 -10%
execute/ count_until	577.03µs	680.30µs	🔴 17.90%	1.16ms	1.28ms	🔴 10.22%	🟡 88%
execute/ factorial_iterative	327.91µs	319.36µs	🟢 -2.69%	539.55µs	536.86µs	⚪ -0.48%	🟡 68%
execute/ factorial_recursive	510.78µs	512.49µs	⚪ 0.57%	673.53µs	670.57µs	⚪ -0.59%	🟢 31%
execute/ fibonacci_iter	1.40ms	1.40ms	⚪ 0.00%	2.94ms	2.65ms	🟢 -9.76%	🟡 90%
execute/ fibonacci_rec	4.31ms	4.17ms	🟢 -3.11%	6.43ms	6.11ms	🟢 -4.93%	🟢 46%
execute/ fibonacci_tail	892.47µs	921.22µs	🔴 3.31%	1.51ms	1.53ms	🔴 1.54%	🟡 66%
execute/ global_bump	704.99µs	798.06µs	🔴 13.21%	1.54ms	1.72ms	🔴 11.40%	🔴 115%
execute/ global_const	682.51µs	738.67µs	🔴 8.27%	1.31ms	1.37ms	🔴 4.21%	🟡 85%
execute/ host_calls	35.86µs	36.55µs	🔴 1.98%	41.74µs	40.71µs	🟢 -2.40%	🟢 11%
execute/ memory_fill	1.14ms	1.21ms	🔴 5.99%	2.21ms	2.23ms	⚪ 1.05%	🟡 84%
execute/ memory_sum	1.13ms	1.15ms	🔴 1.67%	2.43ms	2.26ms	🟢 -7.18%	🟡 96%
execute/ memory_vec_add	2.24ms	2.37ms	🔴 5.75%	4.37ms	4.42ms	⚪ 1.11%	🟡 86%
execute/ recursive_is_even	710.17µs	688.20µs	⚪ -1.64%	1.05ms	990.82µs	🟢 -5.42%	🟢 44%
execute/ recursive_ok	100.17µs	101.02µs	⚪ 0.90%	148.90µs	145.90µs	🟢 -1.96%	🟢 44%
execute/ recursive_scan	133.71µs	136.15µs	🔴 1.83%	194.71µs	190.11µs	🟢 -2.42%	🟢 40%
execute/ recursive_trap	9.65µs	9.67µs	⚪ 0.46%	14.75µs	14.85µs	⚪ 0.63%	🟡 54%
execute/ regex_redux	465.89µs	472.02µs	🔴 1.91%	826.37µs	794.37µs	🟢 -3.94%	🟡 68%
execute/ rev_complement	431.12µs	434.34µs	⚪ 0.69%	852.14µs	797.21µs	🟢 -6.55%	🟡 84%
execute/ tiny_keccak	326.58µs	323.59µs	⚪ -0.82%	658.08µs	674.70µs	🔴 2.69%	🔴 109%
execute/ trunc_f2i	729.97µs	739.48µs	🔴 1.28%	1.65ms	1.56ms	🟢 -5.37%	🔴 112%
instantiate/ wasm_kernel	53.91µs	53.72µs	⚪ -0.30%	55.72µs	59.58µs	🔴 7.77%	🟢 11%
translate/ erc1155	196.71µs	197.20µs	⚪ 0.40%	444.96µs	435.53µs	🟢 -2.50%	🔴 121%
translate/ erc20	97.87µs	96.79µs	⚪ -1.04%	218.83µs	207.72µs	🟢 -4.44%	🔴 115%
translate/ erc721	137.29µs	137.46µs	⚪ 0.03%	309.10µs	303.25µs	🟢 -4.27%	🔴 121%
translate/ spidermonkey	61.25ms	60.85ms	⚪ -0.58%	0.00ns	0.00ns	⚪ 0.13%	🟢 -100%
translate/ wasm_kernel	3.97ms	3.93ms	⚪ -0.61%	8.00ms	8.04ms	⚪ 0.17%	🔴 104%

Link to pipeline

[codecov-commenter]

Codecov Report

Merging #727 (abbc464) into master (4fb164c) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #727   +/-   ##
=======================================
  Coverage   79.08%   79.08%           
=======================================
  Files         102      102           
  Lines        8755     8755           
=======================================
  Hits         6924     6924           
  Misses       1831     1831           

Impacted Files	Coverage Δ
crates/wasmi/src/engine/const_pool.rs	81.81% <100.00%> (ø)

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