Unionize actor heap large and small chunks #2817

Job	Run time
aarch64 Linux glibc	22m 23s
arm64 Apple Darwin	15m 35s
armhf Linux glibc	27m 51s
arm Linux glibc	28m 1s
riscv64 Linux glibc	23m 47s
Lint bash, docker, markdown, and yaml	1m 43s
Validate GNU Docker image builds	34s
Validate GNU Docker release image builds	30s
Validate musl Docker image builds	26s
Validate musl Docker release image builds	28s
Validate Windows Docker image builds	3m 33s
Validate Windows Docker release image builds	2m 53s
x86-64 Linux glibc	22m 28s
Verify CHANGELOG is valid	8s
x86-64 Linux musl	23m 27s
x86-64 Apple Darwin	23m 25s
x86-64 Windows MSVC	37m 43s
use dtrace	19m 58s
use pool_memalign	23m 30s
use runtimestats	21m 52s
	5h 0m 15s

Provide feedback