spirv: only set LocalSizeId mode when necessary #569

Job	Run time
emscripten	2m 56s
android (ON, 23.2.8568313)	9m 37s
linux (clang, clang++, Debug)	8m 36s
android (ON, 25.2.9519653)	8m 31s
Linux Backcompat	18m 7s
android (OFF, 23.2.8568313)	8m 25s
linux-asan (gcc, g++, Debug, -fsanitize=address)	14m 17s
linux (clang, clang++, Release)	8m 48s
android (OFF, 25.2.9519653)	7m 13s
linux-asan (gcc, g++, Debug, -fsanitize=thread)	26m 57s
linux (gcc, g++, Debug)	15m 3s
macos (macos-11, clang, clang++, Debug)	12m 30s
linux (gcc, g++, Release)	9m 35s
macos (macos-11, clang, clang++, Release)	1h 53m 59s
windows (windows-2019, windows, Debug)	7m 43s
macos (macos-11, gcc, g++, Debug)	12m 52s
windows (windows-2019, windows, Release)	8m 43s
macos (macos-11, gcc, g++, Release)	12m 15s
macos (macos-12, clang, clang++, Debug)	13m 53s
macos (macos-12, clang, clang++, Release)	11m 22s
macos (macos-12, gcc, g++, Debug)	13m 2s
macos (macos-12, gcc, g++, Release)	10m 40s
	5h 55m 4s

Provide feedback