Fix warnings in hlsl-codegen #5150

Job	Run time
macOS / Debug / homebrew-clang	6m 47s
Windows / Debug / clang	18m 30s
Windows / Release / clang-cl	21m 44s
Windows / Release / cl	33m 7s
Windows / Debug / clang-cl	19m 4s
Release / ubuntu-24.04 / x86_64 / gcc	38m 4s
macOS / Release / system-clang	8m 36s
macOS / Debug / system-clang	7m 14s
Release / ubuntu-24.04-arm / aarch64 / clang	10m 46s
Windows / Debug / cl	25m 34s
Release / ubuntu-24.04 / x86_64 / clang	26m 57s
Debug / ubuntu-24.04-arm / aarch64 / gcc	7m 3s
macOS / Release / homebrew-clang	6m 29s
Windows / Release / clang	24m 41s
Debug / ubuntu-24.04 / x86_64 / gcc	22m 35s
Release / ubuntu-24.04-arm / aarch64 / gcc	9m 18s
Debug / ubuntu-24.04 / x86_64 / clang	23m 28s
Debug / ubuntu-24.04-arm / aarch64 / clang	9m 59s
	5h 19m 56s

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