Fix generation of invalid LLVM IR #2677

Job	Run time
armhf Linux glibc	27m 19s
aarch64 Linux glibc	22m 5s
arm Linux glibc	27m 30s
riscv64 Linux glibc	20m 0s
Lint bash, docker, markdown, and yaml	1m 19s
Validate GNU Docker image builds	49s
Validate GNU Docker release image builds	36s
Validate musl Docker image builds	23s
Validate musl Docker release image builds	21s
Validate Windows Docker image builds	1m 47s
Validate Windows Docker release image builds	1m 6s
Verify CHANGELOG is valid	8s
x86-64 Linux glibc	21m 49s
x86-64 Apple Darwin	26m 19s
arm64 Apple Darwin	16m 2s
x86-64 Linux musl	21m 35s
x86-64 Windows MSVC	37m 54s
use dtrace	21m 3s
use pool_memalign	23m 20s
	4h 31m 25s

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