Compute can_holser once per save to speed up `d:` filter from ~20s to ~5s #103148

Job	Run time
skip-duplicates-data	6s
skip-duplicates-data	6s
skip-duplicates-code	5s
skip-duplicates-code	5s
matrix-variables	1s
matrix-variables	1s
Basic Build and Test (Clang 10, Ubuntu, Curses)	39m 9s
Basic Build and Test (Clang 10, Ubuntu, Curses)	1h 6m 51s
Clang 14, macOS 12, Tiles, Sound, x64 and arm64 Universal Binary	1s
Clang 14, macOS 12, Tiles, Sound, x64 and arm64 Universal Binary	1s
GCC 9, Curses, LTO	1s
GCC 9, Curses, LTO	1s
Clang 12, Ubuntu, Tiles, ASan	1s
Clang 12, Ubuntu, Tiles, ASan	1s
GCC 11, Ubuntu, Curses, ASan	1s
GCC 11, Ubuntu, Curses, ASan	1s
GCC 9, Ubuntu, Tiles, Sound, CMake	1s
GCC 9, Ubuntu, Tiles, Sound, CMake	1s
emscripten	0s
emscripten	0s
	1h 46m 34s

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