perf: optimize instruction cache indexing to reduce local hotspots (#… #207

Job	Run time
linux-native-ci-asm (ubuntu-latest)	1m 42s
linux-native-ci-asm-chaos (ubuntu-latest)	1m 43s
linux-arm-ci-asm	7m 54s
linux-native-ci-asm (ubuntu-24.04-arm)	2m 25s
linux-arm-test-suite	6m 0s
linux-native-ci-asm-chaos (ubuntu-24.04-arm)	2m 35s
linux-native-test-suite (ubuntu-latest)	2m 56s
linux-x86-ci (ubuntu-latest)	1m 50s
linux-native-test-suite (ubuntu-24.04-arm)	5m 5s
linux-native-test-spawn (ubuntu-latest)	1m 48s
linux-x86-ci-generated	14s
linux-x86-ci (ubuntu-24.04-arm)	2m 39s
linux-native-test-spawn (ubuntu-24.04-arm)	2m 47s
linux-x86-deny	32s
windows-x86-ci-asm	5m 20s
macos-x86-ci-asm	1m 44s
	47m 14s

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