Normalize fuel costs to roughly 1 fuel per executed instruction

[Robbepop]

Closes #701.

[paritytech-cicd-pr]

BENCHMARKS

	NATIVE			WASMTIME
BENCHMARK	MASTER	PR	DIFF	MASTER	PR	DIFF	WASMTIME OVERHEAD
execute/ bare_call_0	1.51ms	1.51ms	⚪ 0.62%	1.38ms	1.36ms	🟢 -0.77%	🟢 -10%
execute/ bare_call_0/typed	1.13ms	1.14ms	⚪ -0.05%	959.08µs	945.68µs	🟢 -1.51%	🟢 -17%
execute/ bare_call_1	1.56ms	1.56ms	🔴 -0.52%	1.44ms	1.48ms	🔴 3.20%	🟢 -5%
execute/ bare_call_16	2.48ms	2.55ms	🔴 2.82%	3.36ms	3.79ms	🔴 12.73%	🟢 49%
execute/ bare_call_16/typed	2.05ms	1.78ms	🟢 -13.32%	1.62ms	1.63ms	⚪ 0.42%	🟢 -9%
execute/ bare_call_1/typed	1.23ms	1.23ms	⚪ 0.55%	1.24ms	1.35ms	🔴 8.86%	🟢 9%
execute/ bare_call_4	1.74ms	1.77ms	⚪ 1.34%	1.79ms	1.81ms	⚪ 1.03%	🟢 2%
execute/ bare_call_4/typed	1.27ms	1.28ms	⚪ 1.10%	1.20ms	1.19ms	⚪ -1.26%	🟢 -8%
execute/ br_table	1.32ms	1.30ms	⚪ -1.03%	1.47ms	1.43ms	🟢 -2.40%	🟢 10%
execute/ count_until	707.69µs	651.45µs	🟢 -8.02%	1.01ms	980.77µs	🟢 -2.71%	🟡 51%
execute/ factorial_iterative	368.84µs	342.00µs	🟢 -7.39%	449.24µs	447.57µs	⚪ -0.02%	🟢 31%
execute/ factorial_recursive	598.76µs	594.70µs	⚪ -0.72%	837.84µs	849.71µs	🔴 1.48%	🟢 43%
execute/ fibonacci_iter	1.47ms	1.64ms	🔴 11.91%	2.06ms	2.05ms	⚪ 1.13%	🟢 25%
execute/ fibonacci_rec	4.94ms	4.83ms	🟢 -1.87%	7.50ms	7.31ms	🟢 -2.44%	🟡 52%
execute/ fibonacci_tail	1.20ms	1.22ms	🔴 1.16%	1.56ms	1.53ms	🟢 -1.78%	🟢 26%
execute/ global_bump	800.67µs	793.71µs	⚪ -0.88%	1.35ms	1.32ms	🟢 -2.16%	🟡 66%
execute/ global_const	811.29µs	715.35µs	🟢 -11.69%	1.17ms	1.17ms	⚪ 0.00%	🟡 64%
execute/ host_calls	35.69µs	36.53µs	⚪ 1.15%	50.48µs	46.78µs	🟢 -7.44%	🟢 28%
execute/ memory_fill	1.21ms	1.21ms	⚪ -0.44%	1.76ms	1.76ms	⚪ 0.33%	🟢 46%
execute/ memory_sum	1.19ms	1.19ms	⚪ -0.10%	1.79ms	1.83ms	🔴 3.41%	🟡 55%
execute/ memory_vec_add	2.39ms	2.39ms	⚪ 0.05%	3.84ms	3.94ms	🔴 2.76%	🟡 65%
execute/ recursive_is_even	1.05ms	1.00ms	🟢 -4.29%	1.60ms	1.68ms	🔴 4.41%	🟡 67%
execute/ recursive_ok	122.42µs	122.12µs	⚪ -0.30%	190.21µs	194.19µs	🔴 2.07%	🟡 59%
execute/ recursive_scan	157.70µs	157.25µs	⚪ -0.57%	238.93µs	242.38µs	⚪ 1.07%	🟡 54%
execute/ recursive_trap	12.46µs	12.42µs	⚪ -0.21%	20.54µs	21.14µs	🔴 2.76%	🟡 70%
execute/ regex_redux	499.77µs	496.71µs	⚪ -0.69%	815.38µs	807.36µs	⚪ -0.78%	🟡 63%
execute/ rev_complement	455.77µs	458.07µs	⚪ 0.61%	719.64µs	713.33µs	⚪ -1.05%	🟡 56%
execute/ tiny_keccak	325.63µs	341.69µs	🔴 4.72%	552.79µs	542.21µs	⚪ -1.40%	🟡 59%
execute/ trunc_f2i	781.09µs	772.03µs	⚪ -1.19%	1.46ms	1.39ms	🟢 -4.92%	🟡 80%
instantiate/ wasm_kernel	54.63µs	52.60µs	🟢 -4.06%	55.43µs	56.91µs	🔴 3.23%	🟢 8%
translate/ erc1155	236.94µs	235.51µs	⚪ -0.41%	441.03µs	444.02µs	⚪ 0.49%	🟡 89%
translate/ erc20	114.86µs	114.39µs	⚪ -0.45%	211.32µs	216.17µs	🔴 2.24%	🟡 89%
translate/ erc721	163.38µs	162.78µs	⚪ -0.15%	309.77µs	314.40µs	🔴 1.64%	🟡 93%
translate/ spidermonkey	0.00ns	0.00ns	⚪ 0.36%	0.00ns	0.00ns	⚪ 0.60%	🟢 0%
translate/ wasm_kernel	4.19ms	4.19ms	⚪ -0.30%	7.96ms	8.06ms	🔴 1.34%	🟡 92%

Link to pipeline