Add base cost to consume_wasm_execution_units host function

[lrubasze]

Summary

Added WASM execution unit base to assure simple WASM calls are not being undercharged.

Motivation

Test	Base	PR	%
costing::scrypto_malloc	592.2±0.84ms	504.3±2.87ms	-14.84%
costing::scrypto_sbor_decode	569.5±1.32ms	500.3±2.76ms	-12.15%
costing::scrypto_sha256	392.4±1.20ms	367.5±1.57ms	-6.35%
costing::spin_loop_v1	628.2±5.74ms	474.9±2.19ms	-24.40%
costing::spin_loop_v2	2.7±0.00s	959.4±0.90ms	-64.47%

Based on the benchmarks on the base, the spin_loop_v2 does not finish within 1 second, despite consuming around 100 million execution cost units.

It's made possible by iterating an empty code block (except a br instruction), where consume_wasm_execution_units host function becomes the dominant factor.

This PR fixes it by introducing a base cost to account for the execution of the host function itself.

[github-actions]

Docker tags
docker.io/radixdlt/private-scrypto-builder:4af62f6941

[github-actions]

Benchmark for 4af62f6

Click to view benchmark

Test	Base	PR	%
costing::bench_prepare_wasm	44.3±0.09ms	44.4±0.16ms	+0.23%
costing::decode_encoded_i8_array_to_manifest_raw_value	19.3±0.02ms	19.4±0.05ms	+0.52%
costing::decode_encoded_i8_array_to_manifest_value	41.5±0.09ms	41.7±0.09ms	+0.48%
costing::decode_encoded_tuple_array_to_manifest_raw_value	61.3±0.31ms	61.0±0.18ms	-0.49%
costing::decode_encoded_tuple_array_to_manifest_value	99.0±0.29ms	99.5±0.22ms	+0.51%
costing::decode_encoded_u8_array_to_manifest_raw_value	32.4±0.08µs	25.8±0.08µs	-20.37%
costing::decode_encoded_u8_array_to_manifest_value	41.6±0.12ms	41.7±0.13ms	+0.24%
costing::decode_rpd_to_manifest_raw_value	12.7±0.02µs	12.8±0.04µs	+0.79%
costing::decode_rpd_to_manifest_value	10.8±0.08µs	10.9±0.04µs	+0.93%
costing::deserialize_wasm	1207.2±5.18µs	1206.6±8.31µs	-0.05%
costing::execute_transaction_creating_big_vec_substates	696.7±8.52ms	696.3±8.88ms	-0.06%
costing::execute_transaction_reading_big_vec_substates	580.0±1.22ms	685.3±2.35ms	+18.16%
costing::instantiate_flash_loan	859.3±400.90µs	1024.2±1035.07µs	+19.19%
costing::instantiate_radiswap	933.6±630.53µs	917.9±463.35µs	-1.68%
costing::scrypto_malloc	595.7±0.71ms	498.4±0.58ms	-16.33%
costing::scrypto_sbor_decode	560.2±1.64ms	489.4±0.89ms	-12.64%
costing::scrypto_sha256	390.7±1.36ms	359.9±0.69ms	-7.88%
costing::spin_loop_v1	614.6±0.74ms	476.5±7.74ms	-22.47%
costing::spin_loop_v2	2.7±0.15s	953.4±0.68ms	-64.69%
costing::validate_sbor_payload	30.3±0.09µs	32.0±0.09µs	+5.61%
costing::validate_sbor_payload_bytes	251.5±0.82ns	252.5±1.89ns	+0.40%
costing::validate_secp256k1	76.7±0.81µs	76.7±0.07µs	0.00%
costing::validate_wasm	33.4±0.03ms	33.5±0.07ms	+0.30%
decimal::add/0	8.4±0.00ns	8.4±0.00ns	0.00%
decimal::add/rust-native	9.8±0.00ns	9.8±0.00ns	0.00%
decimal::add/wasmi	220.3±0.27ns	219.2±0.30ns	-0.50%
decimal::add/wasmi-call-native	2.1±0.00µs	2.1±0.01µs	0.00%
decimal::div/0	169.0±0.24ns	168.4±0.13ns	-0.36%
decimal::from_string/0	155.8±0.09ns	155.9±0.13ns	+0.06%
decimal::mul/0	129.3±0.11ns	129.0±0.24ns	-0.23%
decimal::mul/rust-native	127.4±0.18ns	125.8±0.29ns	-1.26%
decimal::mul/wasmi	11.6±0.10µs	11.7±0.10µs	+0.86%
decimal::mul/wasmi-call-native	2.3±0.00µs	2.2±0.00µs	-4.35%
decimal::pow/0	593.5±0.23ns	592.6±0.49ns	-0.15%
decimal::pow/rust-native	589.9±0.38ns	589.1±0.41ns	-0.14%
decimal::pow/wasmi	61.1±0.40µs	58.0±0.72µs	-5.07%
decimal::pow/wasmi-call-native	3.2±0.00µs	3.2±0.00µs	0.00%
decimal::root/0	8.2±0.01µs	8.1±0.01µs	-1.22%
decimal::sub/0	8.3±0.01ns	8.3±0.01ns	0.00%
decimal::to_string/0	446.2±0.28ns	444.7±0.90ns	-0.34%
large_transaction_processing::prepare	2.5±0.00ms	2.6±0.00ms	+4.00%
large_transaction_processing::prepare_and_decompile	6.3±0.03ms	6.2±0.03ms	-1.59%
large_transaction_processing::prepare_and_decompile_and_recompile	28.2±2.15ms	28.9±2.26ms	+2.48%
metadata_validation::validate_urls	4.8±0.02µs	4.7±0.09µs	-2.08%
precise_decimal::add/0	8.8±0.26ns	8.9±0.00ns	+1.14%
precise_decimal::add/rust-native	11.0±0.13ns	10.8±0.12ns	-1.82%
precise_decimal::add/wasmi	286.7±0.73ns	277.2±0.56ns	-3.31%
precise_decimal::add/wasmi-call-native	2.9±0.00µs	2.8±0.00µs	-3.45%
precise_decimal::div/0	286.0±1.15ns	288.2±0.56ns	+0.77%
precise_decimal::from_string/0	203.1±0.13ns	202.1±0.46ns	-0.49%
precise_decimal::mul/0	330.4±2.16ns	331.7±0.43ns	+0.39%
precise_decimal::mul/rust-native	304.5±1.30ns	287.9±0.28ns	-5.45%
precise_decimal::mul/wasmi	35.0±0.08µs	33.9±0.25µs	-3.14%
precise_decimal::mul/wasmi-call-native	3.1±0.01µs	3.1±0.01µs	0.00%
precise_decimal::pow/0	1737.7±3.31ns	1738.5±5.98ns	+0.05%
precise_decimal::pow/rust-native	1375.7±2.60ns	1366.0±5.25ns	-0.71%
precise_decimal::pow/wasmi	167.4±0.46µs	162.9±0.90µs	-2.69%
precise_decimal::pow/wasmi-call-native	5.4±0.01µs	5.3±0.02µs	-1.85%
precise_decimal::root/0	57.9±0.04µs	57.1±0.06µs	-1.38%
precise_decimal::sub/0	8.9±0.02ns	9.2±0.02ns	+3.37%
precise_decimal::to_string/0	696.1±0.26ns	695.9±1.15ns	-0.03%
schema::validate_payload	382.5±0.55µs	386.2±0.48µs	+0.97%
transaction::radiswap	4.8±0.02ms	4.8±0.02ms	0.00%
transaction::transfer	1805.0±4.76µs	1804.6±14.21µs	-0.02%
transaction_validation::validate_manifest	43.2±0.04µs	43.0±0.03µs	-0.46%
transaction_validation::verify_bls_2KB	1044.2±29.77µs	1004.6±7.61µs	-3.79%
transaction_validation::verify_bls_32B	1033.5±30.59µs	1050.7±32.06µs	+1.66%
transaction_validation::verify_ecdsa	74.4±0.07µs	74.5±0.07µs	+0.13%
transaction_validation::verify_ed25519	46.8±0.09µs	42.3±0.08µs	-9.62%